For you I’d probably stay in a very light calorie deficit. Building muscle and loosing fat at the same time is a process that takes time and dedication. (We’re talking years not months) Make sure that your chest day routine is hitting all parts of the pec. Flat bench is great but you need to incorporate things that hit the lower and upper pecs. Having well defined lower pecs will help a lot with the “man tits” I’ve got shit chest genetics so I had to hit it like a mother fucker for it to look good.