i agree with the 500mg per week. but you need to inject it every third day. it's important to keep your test levels constant. if you inject every mon and thurs then from thurs to mon will be 4 days.
going the every mon thurs route is easier to remember but going with the every third day is better for gains.
oh, why every third day? as you know sus is made up of several different tests. the fast acting test will be absorbed in 3 days.