Harve
I think you'll find you'll have a little more power with the Saito 91s. I have both engines and I find my Saito to be a more powerful engine. I think you my even be able to use a 15x6 APC prop with the Saito. It should give you more airspeed than my Magnum 91. I plan on using my Saito 91s in a FunAero Albatross. That would give both my 91's a good home and somone to play with.
I built my Dyanfilte according to plan so I am sorry I cannot help you with lowering the top wing. I know it would be more to scale, but it is just a fun scale airplane and mine flys like a dream. Hope you have lots of air time with yours.
Thanks