You need to give us your stats in order to better advise you. But I'm not a fan of such long cycles I would do a bulk take time off ten do the cutter . It will take you a few months to fully recover and you will have to wait a while to jump on it again .
I personally just recently came off of a 20 week cycle myself, and they were all right... my growth stopped after the first couple of months and i didn't have enough to up the dosage enough. i wish i had just saved the rest. Waisted money IMO.
with a cut at the end i do think it will be productive...
growth will slow a lot, but you will be able to maintain size very will and the fat will be able to come off just fine if you diet and train right...
you need to cut your test back to 12-14 weeks... there's no need on this cycle to go over that... if you were running eq or primo, then it would be understandable, but your not so there is no point in this