The reason people say 500mg/week is not just random bro science - there is reason behind it! For MOST people It's the maximum amount of testosterone/week that will give the average person the most amount of gains with the least amount of side affects.

If you're looking to do a recomp cycle - which is SLOWLY lowering your body fat without loosing any lean muscle mass then you don't need any other compounds and 400mg/week of testosterone will plenty because you're just using the testosterone to keep your body in an anabolic state to help preserve muscle loss. Body recomps generally take a pretty long time to do and IMHO it would be more realistic to expect to do it over 20 weeks not 10!!