What is your time-frame?
I would worry about getting my BF down to 10-12% first, and then plan for a prep.
20 weeks is plenty of time. I read your stats than opened your pics and you look good, actually a lot bigger then I thought.
No glaring weaknesses, go for it.
I dont know who told you you were %15b/f. More like %12 tops.
Damn bro you've grown like crazy from the last set of pics I saw of you over on WBB. Nice work.