Dale, I grew up on KY Lake and my father owned a large boat yard there until a couple of years ago. Sadly the cat scene there is little to non-existent now.
A good place to get a comparison of relative performance would be the Small Catamaran Handicap Rating System (SCHRS). https://www.schrs.com/ratings.php
An SC17 rates 1.081 while an H-16 is 1.197 and an H-18 is 1.080 (higher is slower); as such, you should be very close to an 18.