when you guys say your tires don't last long or that the knobs rip off, what compound are you referring to?
The harder compound (60 durometer) will last longer than the softer compound (40, 42, 50 durometer), but the softer compound will grip better... Do you have problems with 60a tires?? Or just the soft ones?
I like Maxxis Minion DHF 2.5 and Highroller 2.35 for the dry stuff out here.
For your wet conditions, this same combination bumped up in size would probably be good (Minion DHF 2.7 / Highroller 2.5)...
Also, not to just confuse you further, but if you are trying tires... you might want to look at the little-known-in-the-US Schwalbe :
Al Mighty These look great, and they come in 24".
-sunny