I know that on my enforcer, I was running an OS.91, and it flew kinda doggy, for a lack of better words.. I do believe however, that the OS engine I was using was pretty old and tired..  I then put on an Evolution 1.0, and the plane came to life..  flew great, had that awesome sound that these planes with the prop swinging through the slot in the fuse produces, very Unique, and cool sounding.. 

Basically, I think you would be better off going with an engine of larger displacement than  the .75, I think you would be a bit disappointed in its flight characteristics with an engine of that displacement..  Just my opinion tho!! 

Have a great day!

Craig.