I recently took the plunge and adjusted the setup on my SE CU24, using some youtube videos for PRS trem installation and setup from John Mann's youtube page, and now I can dive bomb quite a bit and still come back almost perfectly in tune. I noticed that my bridge plate was uneven when viewed from the back - treble side was closer to the body than the bass. Tuning stability was good with mild to moderate trem use, but big dives still messed things up. I'll try to describe what I did to fix it, maybe it'll help.
Noteworthy, long ago I installed a TUSQ XL nut and Grover locking tuners very similar to the S2 tuners.
With all strings removed and springs disconnected, I unscrewed the inner four pivot screws so the notches were well above the plate (far enough that the knife edge wasn't going to pivot on those screws). Next, adjusted the outer two screws, which the trem is pivoting on, so the bridge is about 2mm off the body. Not super important exactly how high, just that both sides are EVEN. Then, similar to John Mann's video, used a small hex key as a feeler gauge to set the height of the four inner screws. I used a 1/16", vs the 2mm that John uses, just what I had on hand. About the same size, so no big deal. However, instead of going individually as John did in his vid, I took the key and spanned it the long way under several screws at a time. The longer section of the key I used would span the width of 4 screws. Get the key in tightly under the bass side end screw. It should also extend to 3 other pivot screws, but those are raised from before and therefore not tight on the hex key yet. Tighten those inner screws one by one. When the bridge starts to raise as you screw in a screw, stop and back it off to the point where the bridge sits back down (1/8-1/4 turn). Then span the hex key under the screws from the treble side, and adjust the remaining inner screw. Recheck both sides with the hex key, this should get all the pivot screws nicely aligned at the same height. Make small adjustments if needed, being sure to keep the height even on both sides. Apply some thin oil to the knife edge. Re-attach springs. String the guitar. Bring the low E to pitch, then the high E and B, then A, then G, then D. Similar to how you tighten tire lugs in a star pattern, add tension in an even manner to the strings, don't just start on one side and move across. Rene Martinez Graphite All to all string slots on the nut, and make sure it's worked under the strings well. Tune, while continually stretching the strings and working the trem. Make sure to always work the trem while tuning..
This system got me in very good shape. How much of it really did anything, and how much is hocus pocus, I don't know, but my guitar stays in tune now!
