This nose over stuff don't sound good. I'm building a Saratoga now and I would expect H9 designers to consider that kind of thing.
The LG has a slight slant to it but I don't have tail feathers on yet to check on stab level. How much thickness did you put on trailing edge of LG?

Seems if the CG is even close it shouldn't want to nose over.

On my Arrow RTF I got in the habit of up elevator to keep weight off the front tri-cycle gear as it would tip on our rough field, that worked out great so I don't see up elevator while taxi-ing a problem.

Putting a OS 55 in it.