i could literally not tell any difference between 1g and 2g test at all, except more bloat (but not of the good kind, just bad water)
on the other hand i feel like i NEED around a gram of test in any bulking cycle though, otherwise the fullness is just NOT there, no matter what else i run. my go to stack is test/tren/npp and without a gram of test you just look flat on that stack, even when shoveling the carbs up your ass. add in a gram of test and BOOM you instantly explode in size
low to moderate test is great for cutting / looking good year round but absolute shit for mass gaining imo.
might try 1.5-2g test again with peptides and slin to see if the body can use more of it that way.