It really depends on the person...some people get to superphysiological levels off of 100mg per week, some dont notice anything. I suggest getting some bloodwork done to see where you sit at and then go from there. Just remember, you are on TRT, you are not using this to "get big" but to feel normal, so dont push the envelope with your Dr too much with trying to up your dose.
Does he have you on HCG as well? If not, you may want to try that out as well before upping your dose of test. Print out the "Reciepe for Success" that SWALE has and show that to your Dr. Just remember, the shots take a bit to kick in, not like the gels. Its also not unheard of for a Dr. to prescribe 250mg/week of test for users that do not see much off of the 100mg, however, you will want to increase from 100mg at 20mg intervals and get bloodwork done to see how much it affects you so that you dont jump too much in how much you take per week.