I get some mild estrogen modulation from proviron but that doesn't mean you will. Some guys do and some don't. You won't know till you try it.
Do your self a huge favor and get on a better injection schedule. 2 or 3 times a week. With 1 per week you are making a BIG spike in testosterone and estrogen followed by a 7 day decline. Essentially your hormones are riding a roller coaster with steep ups and downs. 3x a wk is a lot to some people so if I don't want to do 3x per wk then do 2. 2 is the minimum to me. Mon and Thurs or Tues and Fri. You choose. Just do 75mg each shot if u do twice per wk.
A better injection schedule alone may increase your libido. You are also on such a small dosage (which is consistent with TRT for a lot of guys) but with the smaller dosage I'd venture to say by day 5 and 6 your levels are WAY down and on day 7 before your shot they are even lower.
3x a wk is my personal favorite as that is where I feel the best but 2x a week is good too and by far better than 1x