Well, based on what Jim said, I decided to look at it again from a different angle. It seems that as I lock the bolt, the cocking sleeve engages sear (as one would expect), however it seems to be pushing the sear down more than it should. I say this because if I press slightly up against the sear as I lock the bolt, the cocking sleeve is in a position that allows me to operate the safety. So, it seems as though the sear isn't pushing up hard enough or the cocking sleeve is pushing back too hard. It would seem to me that I either need to get the sear to push up more firmly or keep the cocking sleeve from pushing against the sear so much. Any ideas?
Edit: OK, upon closer inspection, it appears that is the sear is in the correct postion, otherwise it doesn't engage the trigger properly. It just seems like the cocking piece needs to come back a fraction of an inch more so I can engage the safety.
Second edit: I've reassembled the bolt with no striker spring. I've been playing with the cocking piece, varying the pressure on it. Based on this, my gut feeling is that the spring is just applying too much pressure. Does this make sense to anyone? Is there any way I could be assembling it wrong to cause this? The bolt sleeve is screwed all the way on (the stop is right up to the bolt arm). Short of snipping off a loop (unfortunately, I don't have a spare spring to experiment with) or filing on the cocking piece (not sure how much I'd have to take off to get it to engage), I'm at a loss.
Here are some pictures.