Hi!
Darryl Caddy is pylon racer! Like him I have been active in pylonracing for decades.
I can assure you that all two strokes today can cope with a 4-6inches hight difference easily as long as you don't fly with the boat! Then it's another story.

Best tank is like I said a Tettra tank! Of course it would be best to mount a tank just behind the firewall , but if that isn't possible the next best is a bubbleless tank!