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I had the same problem with my guarder slide, will be staying away from them if I do get another Glock. I fixed mine by sanding the BBU, but only enough that it was still able to push down and lock the hammer. I stripped all the internals from the slide leaving only the BBU and I manually cycled the gun with my hand to identify the exact contact point causing the drag. I sanded it slowly until I got the smoothness I desired. I also sanded the lugs on the frame and polished them to ensure that minimal friction was present and used 2 recoil springs together.
The other thing is, I upgraded to the AIP steel trigger kit (not sure if its the same as the 8mm bearing that you're getting) and the included bearing is slightly larger with the stock counterpart which makes pushing it backwards via the slide even harder. Either opt out with a smaller bearing or mod your BBU. I only tend to mod parts that I know I can have access to in case if I screw up, but luckily, I didn't.
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