You'll catch that 4 lber... my pond record was 4.5lbs for years, then one evening I caught a 6.5 lber, I tag my fish and she had no tag so I probably had not caught her before or a least while she was over 3lbs. In the begining my pond was like a lot, heavy on small bass and I started removing them... but I used small baits to catch them, once I started using larger baits I started catching larger bass, not near as many but larger.

Sounds like the tilapia are a blast to catch at that size!
How bigs that gator now?

Good luck!