300 twice a week or 200 every other day should do it... every other day, twice a week, doesn't matter. I get the 2000iu amps, so easy to do the 200 every other day with a slin pin. I do mine IM also
Gonadatropins like HCG can't directly cause gyno. But the HCG will stimulate your testes (gonads) which will produce testosterone which can then convert to estros and the estros cause your gyno. So if you got gyno from HCG, you'd get gyno from cycling too much testosterone as well. You probably used it to regain testicular size and never considered that it would elevate your testosterone level.