Keep in mind that I had mostly the same problems with 2.17 as well.
ok, soft reset and open both gives 19mb free.
Start browsing and then stop leaves it at 15mb free.
A couple mins moving around on gmaps brings it down to 14.
Turn on gps and it goes to 13 free.
The first test was after it had not been reset since last night and I just picked it up and opened those and did the same as above. This second test looks much better, but give it a good hour of heavy use and it's crawling again. This was all the same on the 2.17 rom too, except memory management wouldn't intentionally crash pie when memory came close to being full. (...or whatever's doing that)
I'm the type of person that doesn't have time to tweak. I just need the thing to work 99% of the time, instead of pulling it out to quickly cross reference something and having to screw around with it for 5 minutes.
On the plus side:
Evdo is only finicky sometimes on boot and locks on once I place a phone call and hang up. In fact, I'm having VERY FEW problems with EV dropping once it's locked. This is ten times better than it used to be.
Rev A is good but not great. Download speeds have jump from 400-500kbps to 800-1000kbps. But for some reason web pages load and scroll slower. (maybe just pie problems?)