The four star seems to handle extra power really well. I have a 4*60 with a YS .91 FZ with a 14 oz Sullivan tank and a 15x6 APC. The Saito 100 should fly pretty close to mine if not identical. Hovering is not problem, I added 1 inch extra to the rudder and to the elevators and increased the throws which allows the plane to knife edge with no problem also. I incorporated a pull pull system and dual elevator servos, which saved the plane a couple of weeks ago when one of the elevator servos stripped out in flight. I hate to imagine if I had one and it went out. With flapperons engaged, full flaps down and 8% up elevator, this slows the plane down nicely and keeps it level. Can crawl pass the runway if you want to, then take off vertically with no hesitation. With extra power on this plane, make sure there is no flutter in the stab. My stab fluttered severely until I relocated the control arms which seemed to resolve the problem. With these motors (YS 91 or Saito 100), the plane should not be given throttle when diving. Extremely too fast, which could lead to failure of some type. Other than that, this plane loves the extra power and flys wonderfully.

Just my opinion of the plane with high powered motors,
I will try to post some photos of my plane once I get the photos in digital format.

Derrick