I have a 12x4, I will try that. Dont think there is much point in the 13.5 x4, remember I am flying with a 13x4 and now a 13x6. With the 12x4 my engine will positively scream but let me see.

I frankly have no idea what is the fueled or unfueled weight of the airplane, I dont have a weighing scale for that

Ameyam