I have never used wheels of the recomended size. I always go 1/2" to 1" larger depending on the model. My Sig SE has 3.5" wheels. Think the plans called for 2.75" or something like that.
I like the extra prop clearance and the fact it rolls over some of the smaller boulders and mountians in our grass area.

You will not notice any other than myabe a slight bit of change in the cg depending on how big and heavy they are.