Since I do a bit of 3D, I have the maximum problems with the vertical thing. Couple of weeks back, with the engine set rich (quarter turn), I kept losing power in the vertical and finally deadsticked. After I landed I noticed that the 75ax I was using was overheating. I tried various props from 13x6 to 14x8 and it overheated in all of them to the extent that there was no compression when hot and there was black oil in the exhaust. Finally I shifted from 10% nitro fuel to plain synthetic and since then it has stopped overheating. Today, I tried hovering again, this time with a 15x4 prop. Now I I need to resolve is the amount of throws, because the engine performs quite well.

For the vertical, I get someone to hold the airplane vertical to set the HSN and then set it. This setting is almost always richer in the horizontal than the horizontal tuning and ensures I dont deadstick in the hover.

Anyway, we are digressing from the OP's question

Ameyam