A process for polymerizing a polyethylene composition comprising the steps of: preparing a slurry of a precursor and a viscous inert liquid, said slurry having a viscosity of at least about 500 cp, measured at 1 sec -1 and 20°C, the precursor comprising a formula Mg d Me e X f g, wherein R is an aliphatic or aromatic hydrogen radical having 1 to 14 carbon atoms or COR' wherein R' is a aliphatic or aromatic hydrocarbon radical having 1 to 14 carbon atoms, each OR group is the same or different, X is independently chlorine, bromine, or iodine; ED is an electron donor chosen from an organic Lewis base; d is 0.5 to 56; e is 0, 1 or 2; f is 2 to 116 and g is 1 to 20; Me is a transition metal selected from the group of titanium, zirconium, hafnium and vanadium. contacting the slurry of with a first Lewis Acid such that at least a portion of the organic Lewis Base is complexed with the first Lewis Acid wherein the first Lewis Acid has the formula MR n X (m-n), M is Al, B or Si, R is a C1 to C14 alkyl or aryl radical, X is Cl, Br or I, m satisfies the valency of the metal M, n is 0 to 3; contacting the slurry of with a second different Lewis Acid with the formula MR n X (m-n), M is Al, or B, R is a C1 to C14 alkyl or aryl radical, X is Cl, Br or I, m satisfies the valency of the metal M, n is 0 to 2; feeding the slurry of into a gas phase reactor in which an olefin polymerization reaction is in progress optionally in the presence of one or more cocatalysts and wherein the molar ratios of the first Lewis Acid and the second different Lewis Acid to the electron donor are controlled to affect specific fractions of the molecular weight distribution of the final polymer product; where both the relative ratio of the first Lewis Acid and the second different Lewis Acid to electron donor and the chemical identity of the first Lewis Acid and the second different Lewis Acid is adjusted to polymerize said polyethylene composition, wherein said polyethylene composition comprises at least 2 or more molecular weight distributions, measured via triple detector GPC low angle laser light scattering (GPC-LALLS), wherein each molecular weight distribution has a peak, and wherein measured detector response of peak 1 divided by the measured detector response of peak 2 is in the range of from 0.50 to 0.79. For convention, the highest molecular weight peak is designated Peak 1. preparing a slurry of a precursor and a viscous inert liquid, said slurry having a viscosity of at least about 500 cp, measured at 1 sec -1 and 20°C, the precursor comprising a formula Mg d Me e X f g, wherein R is an aliphatic or aromatic hydrogen radical having 1 to 14 carbon atoms or COR' wherein R' is a aliphatic or aromatic hydrocarbon radical having 1 to 14 carbon atoms, each OR group is the same or different, X is independently chlorine, bromine, or iodine; ED is an electron donor chosen from an organic Lewis base; d is 0.5 to 56; e is 0, 1 or 2; f is 2 to 116 and g is 1 to 20; Me is a transition metal selected from the group of titanium, zirconium, hafnium and vanadium. contacting the slurry of with a first Lewis Acid such that at least a portion of the organic Lewis Base is complexed with the first Lewis Acid wherein the first Lewis Acid has the formula MR n X (m-n), M is Al, B or Si, R is a C1 to C14 alkyl or aryl radical, X is Cl, Br or I, m satisfies the valency of the metal M, n is 0 to 3; contacting the slurry of with a second different Lewis Acid with the formula MR n X (m-n), M is Al, or B, R is a C1 to C14 alkyl or aryl radical, X is Cl, Br or I, m satisfies the valency of the metal M, n is 0 to 2; feeding the slurry of into a gas phase reactor in which an olefin polymerization reaction is in progress optionally in the presence of one or more cocatalysts and wherein the molar ratios of the first Lewis Acid and the second different Lewis Acid to the electron donor are controlled to affect specific fractions of the molecular weight distribution of the final polymer product; where both the relative ratio of the first Lewis Acid and the second different Lewis Acid to electron donor and the chemical identity of the first Lewis Acid and the second different Lewis Acid is adjusted to polymerize said polyethylene composition, wherein said polyethylene composition comprises at least 2 or more molecular weight distributions, measured via triple detector GPC low angle laser light scattering (GPC-LALLS), wherein each molecular weight distribution has a peak, and wherein measured detector response of peak 1 divided by the measured detector response of peak 2 is in the range of from 0.50 to 0.79. For convention, the highest molecular weight peak is designated Peak 1.