Personally, I always do a proper PCT (maybe a little shorter depending on the compound). If I am using stuff that is going to take my body out of homeostasis hormonally, I want to get back there as quickly and efficiently (and safely) as possible.
That being said, Ostarine was very gentle for me, and though I didn't feel any adverse side effects I still PCT'd to be on the safe side. Ostarine and Dermacrine was a great cycle for me, with respect to what you are looking for.
Sparta Lean seems to be helping people do exactly what you are looking to do, so that may very well be an avenue to pursue. I say "seem" only because I haven't had the opportunity to run it yet, so I am going by the information provided in the logs thus far. I am logging Cerberus and am really enjoying it, and seeing definite body composition changes.
Another important consideration is that diet will determine what a compound or series of compounds will do for you. If you are looking to lean out, then your diet needs to reflect that. No product will fix a broken diet.