Specific gravity = SG; Original (start) gravity = OG; Final gravity = FG.
Crash cooling or cold crashing at the end of the fermentation to drop the yeast is not essential just a nice to have. At 15-18*c your pantry is not really going to achieve all that much but you still have nothing to lose by moving your FV in there. After adding hops I would leave it 2 - 3 days in the warm and then the optional cold period
I can't say I have ever come across the instruction to stir the FV as you add your hops. Personally I wouldn't bother. If you do, however, make sure you do not entrain any air into your beer, and in my view a gentle stir is all that is needed.
Crash cooling or cold crashing at the end of the fermentation to drop the yeast is not essential just a nice to have. At 15-18*c your pantry is not really going to achieve all that much but you still have nothing to lose by moving your FV in there. After adding hops I would leave it 2 - 3 days in the warm and then the optional cold period
I can't say I have ever come across the instruction to stir the FV as you add your hops. Personally I wouldn't bother. If you do, however, make sure you do not entrain any air into your beer, and in my view a gentle stir is all that is needed.