Your numbers are not so high that I think that TM is necessarily right for you...yet. The fact is, you're still moving your 5x5...why not do advanced novice, 3x5 on Monday, light day on Wednesday, 3x5 on Friday? Push this as long as possible. That 20lb jump is too much, I don't think you're resting enough (2 minutes is a little short), so back up, regroup, and push LP.
Bottom line: I think you jumped ship on LP a little early...