A method for forming a lubricant base stock having at least a threshold aromatics content during the course of a processing run, the method comprising: hydroprocessing a feedstock under effective hydroprocessing conditions to form a hydroprocessed effluent; separating the hydroprocessed effluent to form at least a gas phase effluent and a liquid phase effluent; dewaxing at least a portion of the liquid phase effluent in the presence of a dewaxing catalyst under effective dewaxing conditions to form a dewaxed effluent; blending at least a portion of the dewaxed effluent with an aromatics-rich base stock to form an aromatics-enriched effluent, the aromatics-rich base stock comprising a Group I base stock, an alkylated aromatic base stock, or a combination thereof, the aromatics-enriched effluent containing about 0.25 wt% to about 1.25 wt% of the aromatics-rich base stock at a first time during the processing run; decreasing the amount of aromatics-rich base stock blended with the at least a portion of the dewaxed effluent at one or more times during the processing run subsequent to the first time; and fractionating at least a portion of the aromatics-enriched effluent to form at least a lubricant base stock product having a viscosity index of at least about 80 and a sulfur content of 300 wppm or less, wherein the lubricant base stock product at the first time during the processing run contains an amount of aromatics corresponding to at least an aromatics threshold amount, and wherein the lubricant base stock product at the one or more times during the processing run subsequent to the first time contains an amount of aromatics corresponding to at least the aromatics threshold amount. hydroprocessing a feedstock under effective hydroprocessing conditions to form a hydroprocessed effluent; separating the hydroprocessed effluent to form at least a gas phase effluent and a liquid phase effluent; dewaxing at least a portion of the liquid phase effluent in the presence of a dewaxing catalyst under effective dewaxing conditions to form a dewaxed effluent; blending at least a portion of the dewaxed effluent with an aromatics-rich base stock to form an aromatics-enriched effluent, the aromatics-rich base stock comprising a Group I base stock, an alkylated aromatic base stock, or a combination thereof, the aromatics-enriched effluent containing about 0.25 wt% to about 1.25 wt% of the aromatics-rich base stock at a first time during the processing run; decreasing the amount of aromatics-rich base stock blended with the at least a portion of the dewaxed effluent at one or more times during the processing run subsequent to the first time; and fractionating at least a portion of the aromatics-enriched effluent to form at least a lubricant base stock product having a viscosity index of at least about 80 and a sulfur content of 300 wppm or less, wherein the lubricant base stock product at the first time during the processing run contains an amount of aromatics corresponding to at least an aromatics threshold amount, and wherein the lubricant base stock product at the one or more times during the processing run subsequent to the first time contains an amount of aromatics corresponding to at least the aromatics threshold amount.