Your worried about what? why?
The only reason to run aground here in cascadia, assuming on the sound or north, not one of the rivers or slightly shallow lakes, is if you are not paying attention.
As far as kelp.......that will catch you be it an angle or straight down!
I would keep what you have frankly. Along with, your draft is pretty shallow all thing considering...... i know of two with 8-9' drafts, your ensy bitty what maybe 4' draft is nothing! 40+ foot power boats have more draft than you!
She drives me boat,
I drives me dinghy!