A process to form an ethylene-based polymer in a reactor system, comprising a Hyper-compressor system, and a reactor configuration comprising a tubular reactor, said tubular reactor comprising a preheater, and wherein the tubular reactor is located downstream from the Hyper-compressor system; said process comprising at least the following steps: a) injecting a first initiator mixture into the tubular reactor at location L along the reactor, b) injecting a compressed make-up CTA system at the location L 1, at a distance (L-L 1) from 145 ∗ D prehehater to 1000 ∗ D preheater, upstream from L, and wherein D preheater = the inner diameter of the pre-heater in meter (m); and wherein L 1 is located in the preheater, and c) optionally, injecting one or more additional compressed make-up CTA system(s) into the preheater, at one or more location: L i, L i+1,..., L n (2 ≤ i and 2 ≤ n), upstream from L 1, and each location is, independently, at a distance from 145 ∗ D prehehater to 1000 ∗ D preheater, and wherein n equals the total number of injection locations of the make-up CTA system(s) injected into the preheater, upstream from L 1, and wherein (L-L 1) is less than each (L-L i), (L-L i+1),..., (L-L n); and d) polymerizing a reaction mixture comprising at least ethylene, the first initiator mixture, and the compressed make-up CTA system of step b), in the reactor configuration, to form the ethylene-based polymer; and wherein the process has a log coefficient of variation (log(CoV 1)), at L 1, that meets the following relationship: log CoV 1 = log CoV 0, L 1 − 0.0223 × L − L 1 D preheater ≤ − 1.30, and wherein 145 ≤ L − L 1 D preheater ≤ 1000, and CoV 0, L 1 = φ ethylenemain flow, L 1 φ make-upCTAsystem L 1 0.5, and φ make-upCTA system, L 1 = the make-up CTA system flow (kg/h) injected into the preheater at location L 1, and φ ethylenemain flow, L 1 = φ ethylenemain flow, front preheater + ∑ i = 2 i = n φ make-up CTA System Li, upstreamfrom L 1; and wherein φ ethylenemain flow, font preheater = ethylene-based feed flow (kg/h) measured at the injection at "front of the preheater," and ∑ i = 2 i = n φ make-up CTA System Li, upstreamfrom L 1 = the sum of the make-up CTA flow(s) (kg/h) injected into the preheater, upstream from L 1; and wherein for i = n, the " φ make-up CTAsystemLi, upstreamfromL1" equals to zero; and wherein, when there are no addition injections of a compressed make-up CTA system into the preheater, then ∑ i = 2 i = n φ make-up CTA system Li, upstreamfrom L 1 is zero. a) injecting a first initiator mixture into the tubular reactor at location L along the reactor, b) injecting a compressed make-up CTA system at the location L 1, at a distance (L-L 1) from 145 ∗ D prehehater to 1000 ∗ D preheater, upstream from L, and wherein D preheater = the inner diameter of the pre-heater in meter (m); and wherein L 1 is located in the preheater, and c) optionally, injecting one or more additional compressed make-up CTA system(s) into the preheater, at one or more location: L i, L i+1,..., L n (2 ≤ i and 2 ≤ n), upstream from L 1, and each location is, independently, at a distance from 145 ∗ D prehehater to 1000 ∗ D preheater, and wherein n equals the total number of injection locations of the make-up CTA system(s) injected into the preheater, upstream from L 1, and wherein (L-L 1) is less than each (L-L i), (L-L i+1),..., (L-L n); and d) polymerizing a reaction mixture comprising at least ethylene, the first initiator mixture, and the compressed make-up CTA system of step b), in the reactor configuration, to form the ethylene-based polymer; and