What Jim said is correct. You're wasting money trying to get the 2.5 to 3.0 levels.
Since you have the 2.5 and it sounds like you are on a budget since you opted to pay $125 for a 2.5 rather than a 3.0 for around $600-$800.
1. Port match everything - LIM, UIM, TB
2. Optimize TB
