Pylon flying...OK...who needs low end torque for that...you're after RPM's! You're still in a small bag of tricks with this engine, but here's a few that are easy to do and will help the top end somewhat...

The Tower .40 has a larger throttle barrel bore than the OS FP .40...that part is interchangeable...no one will notice unless they get a set of calipers out. The spraybar doesn't have to be halfway across the throttle barrel bore either...1/4 way is more than enough, you could even go less since high RPM running will draw fuel fine...more space for air to get through. If you can bore the tail pipe out on the muffler, do it...stock it has a slight taper to the hole. If you choose to bore out the hole, do it a little at a time...otherwise you might split the pipe and ruin the muffler. I bore them out until the hole is about the same diameter as it is at the end of the tailpipe...but the same diameter all the way in...it is a little louder that way. I imagine that you are probably stuck with a set nitro % fuel. The higher the nitro the cooler plug you will need for optimal performance. I typically run 10% nitro and have found that the OS #8 works great on all of my 2 stroke engines. The glowplug is something you might need to do a lot of trial and error checking with to squeeze everything you can out of this engine.

Also...by chance if you can use another engine other than an OS FP .40...get your hands on a TT GP .40 or a Tower .40 and do these same modifications...they will net more top end than the OS FP .40.

A club that uses a bushed .40 for pylon competition has my vote...makes you think a bit and use your skills...I like that!