ok i think i understand what u may mean , so look test e lasts in the system for about 14 days , at 500mg u divide it by 14 = 35.7 mg of test release per day , assuming thats exactly how the ester works , which more then likely is not that simple and has alot of other factors to it . decoanate ester last about 3 weeks dived by 500mg = 23.8 mg pe day released in theory , so 35.7 - 23.8 = 11.9 x 7(week) = 83.3 mg u will need to take extra every week in order to get the extra mg u lack from decoanate being a longer ester compared to enanthate , i think this is what u mean , if not , im completely lost . so an extra 83.3 in theory , which is no way will play out exactly like that in the real world