That tail wheel is not that heavy. I wouldn't worry about the tail wheel unless you need your CG forward and have nothing else to shift forward. The 22x8 will help let the engine run at higher RPM's and you should get better vertical. Usually you need to re-tune after a prop change. With that high outside air temperature you want to make sure the high needle is not overly-lean. Peak RPM is fine but make sure you're on the rich side of that. As Jody taught me, while you are leaning the high needle, it reaches peak RPM and stays at that RPM while you keep leaning. Then after a total of about 1/8 to 1/4 turns past where it peaks, it starts to drop (TOO LEAN !!!!). You want to make sure you stop leaning right when you hit peak. That's what I would do. That way you have some margin. I don't believe in backing off the high needle 200-300 RPM's like glow engines. Gas engines have a pump and don't go lean in vertical uplines. That's a glow engine issue. Running a gas engine rich is not good. It should be just right.