I really doubt that your troubles are related to the head resurface. The 2.6 has such low compression that the modest increase in compression shouldn't hurt. It is a little weird that you are getting coolent in to the cyl. without seeing a loss of compression on one of the cyls. If you are really loosing coolent into the cyl. you are going to have to pull the head again and check it out.
If you do pull the head I strongly recomend you buy a 3m roloc disk. These things are amazing at cleaning up the surface and wont leave harmful debris behing like a scotch brite pad will.

1987 trooper LS.'94 3.2, SAS,35's , lots of dents and rust. Now, improved, with more dents.
1995 trooper LS. Wife won't let me improve this one.
1996 trooper. I'll need something to modify when the '87 finally rusts away.