I have many flights on my Zen-50 with various engines... The best combo was my YS-63FZ 12x7 APC- (Which is similar performance-wise to the Saito-82 ) tons of power yet not too nose heavy---

Yours sounds like a sweet combo to me---

FYI- I also flew mine with a Rossi-60 2 cy. on long-pipe and with a Tower-75 2 cy.