I just serviced a Soviet era Zaria 2009 and I'm having trouble getting the amplitude up. Lift angle set at 44.3 degrees. Readings before service were 144 degree amp. and -247 seconds. The hair spring is fixed so the beat error stayed at 3.6ms. After a good cleaning and lube the amp. went to 149 degrees and the rate was -60 seconds. No matter what I did the movement performed poorly. I checked everything and all looks good. The watch is in excellent shape.
On another watch, Slava 24xx, Russian, after a service the beat error is 0.0, the rate is -/+10 and the amplitude is only 169 degrees with a lift angle of 49 degrees.
My question is, does the Zaria 2009 perform this bad always or are they good movements? Am I missing something? Mainspring is clean and lubed and appears to have good power.