The reason bushing comps do very little to reduce recoil is this. The hole at the end is too large to make an effective gas seal. All it will do is add a little weight to slow down slide velocity. Nothing against anyone else who posted, but it will not increase felt or perceived recoil. Anytime you have more slide mass while shooting the same load, the increased slide mass will serve to dampen felt recoil, though it is by very little.
The way a true barrel compensator with an expansion chamber works is this. As the round leaves the barrel, there is a volume of gas behind it. That gas will expand in 360 degrees as it exits the muzzle. With a comp, it is allowed to expand only slightly before being redirected out the top, usually in a small hole, causing a venturi effect. Like air escaping the end of a balloon, the escaping gas pushes in the opposite direction it is escaping. In the case of a comp, that is down. Also, that volume of gas is moving forward, and hits the front part of the comp, or baffle, pushing forward on the comp. There is a little more recoil reduction there too.
For all this to work, the as must be able to escape the top of the port easier than the front of the comp around the bullet. Therefor, the front exit hole must be barely larger than bullet diameter to form a "gas seal". The exit hole is so large on a bushing comp that almost all the gas that would be used to dampen muzzle flip just escapes out the fron around the bullet. They are a gimmick part that does not do what the manufacturers claim.
Anyway, ream the bushing. I ream until it will just go on the barrel. I then seat it using oil. That means basically lapping it in using only oil, no lapping compound. Once it moves freely, I then cut those reliefs at the 6 front and 12 rear. 12 rear means the rear of the ring that actually contacts the barrel, not the rear most portion of the bushing. Best of luck, and let us know how it turns out.