prop is your fast acting test,in sus 250 there is only 30mg of prop,so you do the math which is more benefical a 30 or 60 or 90mg of prop,and as long as you inject once a week you maintain the levels of the other test,and sus can stay in your system at lo levels up to a month after your last inject,if you worried about 3cc in one shot just split the shot one in each delt or quad or where ever you desire,i do not advocate the glutes,better absorption in the other mucles,
S.R.