I had a bad leak out of my bolt a little while ago, too. I also checked the stickies & replaced the stem o-rings as the sticky recommended. Pointless. It ended up being the bolt sail. It looked okay at first glance. But I replaced it anyway. That stopped the leak right away. Replace yours. It may look good upon initial inspection. Just replace it anyway.
Are you sure you're using 100% Buna o-rings? Most are. But the inner tophat & can o-rings are urethane. I had one of those replaced recently as my bolt wasn't sliding back & forth smoothly. I've never personally taken my LPR out. I'd have to check the manual to see what they use & where.
Some Invaluable Words of Wisdom:
A wise man's heart directs him toward the right, but the foolish man's heart directs him toward the left.
“If you're not a liberal at twenty you have no heart; if you're not a conservative at forty you have no brain.”
-Sir Winston Churchill
"Lousy Democrats."-Homer J. Simpson