I personally won't own a carpeted twobyfore bunk trailer, but I have owned several with keel rollers and swinging bunk rollers in combination with carpeted bunks for extra support. The slides I have used are the EZSlide brand, and they have worked fantastically well on fiberglass hulls.
My only failure was on a light tinny with an unpainted aluminum hull. The slides didn't work at all. Now, before anybody comments, the bunks did not line up with any strakes or rivets or seams. They rode on smooth aluminum. I ended up getting rid of the wood and installing roller bunks.
With your setup I would imagine that you don't have many alternatives. If you DO decide to try them, do the whole bunk, not just half.
Keel rollers for a 24' pontoon ?
Yes the slides CAN help, if the log surface is smooth, painted, and rivet free it will work better.
Finding a way to back further in would be better, or switching to o cantilever trailer would work too, but they are a pain in the butt in my opinion.
If those aren't viable options, how about an tend-a-hitch ?
It is basically a second trailer tongue, mounted below the current tongue.
Get ready to launch.
Disconnect, slide 2nd tongue out, attach, and back her in.
https://extendahitch.net
Sounds like it would be good in your situation.