I don't think the DiablotinXL is built too light. When I had mine with the zdz40 on it, I would swing a 20x10 or 22x8. I did not have problems with vibrations, I also made harier landings without damage to the plane. I G62 in the nose will make this plane super nose heavy, and alot of weight will need to be added to the tail. With my 40 I had 4 servos in the tail, and with radio gear mounted per instructions, it was nose heavy. I cut a hatch in the fuse under the canopy, reached back in the fuse as far as I could, and mounted my Rx battery to the floor, the Rx was just below the pilot, and it still did not exhibit extreme tail heavy ness. I just lost my second DiablotinXL/DA50R combo on its second flight due to complete lock out, but I am getting a third, also for my DA50R/header/KS can engine. I just use one HS5945 on each eileron and elevator, and the new one will have two HS5645 on rudder.
Tthe do need a taller main gear though, especially with a 24" prop that I will swing on the DA50R.
DKjens