I just did the whole insurance thing and have avemco. I have hull at 45K and liability. I had 7 hours of TW and 0 in a kitfox and ~150 TT. They quoted me at $2300. I had to do 10 hours of dual instruction. Once I got to like 21 hours of time in my Kitfox it dropped to $2100. Still expensive and I have the hull pretty high but I want to make sure if I bang up grandpas KF that I can get it all back to 100%. And being a low time TW guy i'm not ignorant to the fact I'm high risk.

The way avemco does their calculations is in a tier system. For home built aircraft they add up your TT, TW, Retracts, and Type time. All those numbers get to a total number.

Tier 1 I think is 0-199
Tier 2 is 200-599
Tier 3 is 600-???? A big number

So if you fly a kitfox with amphibians you are essentially getting 4 "hours" for every 1 you fly.
I fly a kitfox on wheels so I get everything but the retracts time.

So now you can calculate what tier you're in.