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Regardless of the condition of your bearings, check them to see how many ball bearings they have. If they have 8 ball bearings, get rid of them immediately. Lonex is a mediocre brand at best, and their ball bearings are honestly some of the worst on the market. I've seen them break left and right in sub 20 RPS 380 FPS guns running on 7.4 Li-Pos. If they have 7 ball bearings each, they are less shitty, but I still don't trust Lonex bearings since I've seen an 80% failure rate on them in mild setups. If you insist on using them, at minimum put a steel bushing under the spur and under the sector.
Try a different pistol grip. I've found that some HK grips from VFC give a proper motor angle while some do not, I'm not sure why. I had some M27 and 416 builds that sounded great, however when I used a Lonex gearbox shell and 10:1 DSG with the HK grip in my clearsoft gun, it grinded. I swapped to a standard A2 grip and the grinding went away.
SHS pinion is not even remotely similar to the Lonex one. SHS pinion teeth are much thinner as they are probably sintered, Lonex pinions are CNCed and much thicker.
Also, when you test bevel-pinion shimming, you have to test with a wattmeter, and JUST the motor and bevel gear. If you have shimmed it properly, the amp draw should be only slightly more than running the motor on no load.
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