First off your hop-up was probably fine so the dude ripped you off there, remember your upgrades thread? Listen to that advice.
Second Valken BB's are pretty soft in my opinion which can cause issues. As you found out high quality BBs are worth the extra few bucks. Madbull/Elite Force have been steady for me for years.
In regards to magazines yes, their can be compatibility issues between them and rifles. The G&G should work fine overall. Sometimes they need some extra material in the rear of the magazine or mag-well to seat properly, you can search for that as the fix is out there and pretty well-known/used.
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