You may concider a converted ST-2300
I know the converted ST-90 is a real hit.

I have a standard ST-2300 in a 90 size groovy and still had to add nose weight.

How much weight up front do you need to balance the plane, including engine and mount?

I like to fit the biggest engine I can get by with with out adding weight.

Come up with a weight and we'll see what engine will best suit your needs.

Believe me there are plenty of ideas on this forum.