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The needle jet & needle do go oval & affect performance. I check the tube for ovality using a digital microscope but you can often get a feel for...
Ultrasonic cleaning is OK if done properly. Many of the cheaper baths are useless noise generators & a lot of the fluids available are snake oil /...
Could be a sign they're running lean.
If you not already sorted, drop me a PM with your address & I'll post you some out.