Do you have other late payments, or other negative items still present after the 30-60-90 removal? If so, the chances of seeing a score gain from the removal of them is very small and if you did receive any scoring benefit at all it would be a couple of points. I agree that it's great to see lates gone, so regardless of score you're doing the right thing.
Decreasing debt by 3% unless it crossed a threshold likely wouldn't result in a score gain. The inquiry very well could have caused a score drop, although 18 points would be a bit much for a single inquiry.
