Yo! It's me the survival site guy, Russ Pinchbeck to be precise. I understand from your initial question the 2nd curtain is sluggish on slower speeds. This would suggest the slow speed or 2nd pallet mechanism is probably dirty. I've got a Kiev 2 (1951 vintage) coming any day now. I've gathered enough images to describe the total dismantle of a shutter mechanism but I want to do a complete step-by-step procedure for a shutter cleaning. I will probably accomplish this document while working my way through my Kiev 2. Only problem, the weather is still really nice where I live so I'm not inclined to be sitting at my work bench.
Keep your eye peeled for an anouncement on RFF of any new content pertaining to shutter cleaning procedures.
Cheers,
Russ Pinchbeck