Wherry is a great pint I have never had one stick. Stir to oxygenate before the yeast goes in 'til your arm aches then stir 'til it's numb. for stir read whip the air into it like beating eggs 'til the foam exits the fermenter
this and most beers can be helped by a rouse after 24hr this is a gentler stir but some oxygenating helps (a few whips and then gentle like cheese sauce: raise the yeast from the bottom) but never after 24hr a bit like gremlins you will get a bad batch.
The problem is people think they have oxygenated but they haven't and so it sticks, beast the wort 'til you arm is in pain, it is good training for the lifting it will do when the beer needs dispatching.
Just in case people have not quite got the idea yet get an electric drill and a stirrer and spin that for 5 mins at 1400revs that is 7000 stirs that is oxygenated. A minute of hand stirring is what, 120 stirs and no good. Stir the bugger and stir again like it is bad beer and only a flogging will make it pure.
You can not over oxygenate
As for heat 22 is still ok after that it gets funky if the room is a constant 18 you will be ok as the temp increases in the first few days of fermenting and may get to 23 or so but leaving it for 10 days will let the yeast sort out these flavours, anything over 25 -26 will create fusols these are bad bad bad and give bad hangovers and funky tastes.
The fermenter in the bath is good, the wet towel works best with a fan as the evaporation removes the latent heat. A cellar is obvious but hard to dig.
Summer brewing is a pain that is why lots use coolers, I just wait 'til Wimbledon whent he temp drops to 16 for two weeks as per friday