no offense but eating crystal clean wouldn't have you sitting at 25% bodyfat. None the less though since I've had experience with the andros and you seem intent on running the cycle I'll give you my input.
1) they aren't that strong. do they work? yes, but all they do is enhance the work that you already put in. hard work, clean diet, and dedication = good results. if one of those things is off you will be disappointed
2) they don't make you lose rapid amounts of bodyfat fast, can they help? yes, but diet will be the determining factor
3) you're only on it for 6 weeks so don't expect to look drastically different. If you do everything properly, id say you can get to your goal of 18% bodyfat, but dropping 7% bodyfat is no easy feat in 6 weeks since that will require a harsh deficit. So don't expect to gain a ton of muscle (5lbs max).
your dosages are good. Have an AI on hand in case, (letro is my favorite but I also like aromasin alot too). remember high bf% = more of a chance test will convert to estrogen. so watch out for that around week 3.
finally, the andro's don't kick in till about weeks 3-4. so by the time you feel "on" you'll only have two weeks left. run it for 8 weeks that way you can make more muscle gains.
PCT is mixed(I might get flamed for this): I don't really know, imo I've never ran a serm after a 1 andro cycle. Only otc PCT's ( i dosed lower than you plan to though). I have ran serms for other cycle's though. There is a benefit to them and they most def work based on bloods i've done. But sometimes I feel like guy's online go overboard with the whole pct thing and get on a whole new drug regime of like 5 different things after a simple cycle. More isn't better imo. Ultimately its up to your body to recover and messing around with other drugs can sometimes be a waste of money and do nothing. But since you're on for a longer time it would be the safe bet to run a serm for a little. nolva at 10mgED for 3-4 weeks along with sup3r pct or another good natty pct product should be more than enough.