You are absolutely right about that neck angle aspect! I can’t say whether Jeff Beck employs this technique, but catch this- I used paint stripper to remove the finish off of my strat(both the neck and the body) and it changed the way the neck fit in the pocket- a upward tilt- so as the action gradually increases as the strings move up the fretboard, somewhat like an archtop. This allows for unusally low action all the way up to about the 11th fret , with no buzzing anywhere, and then it gets sort of high around the 17th( about 4/32” with the strings depressed at first fret). It’s a Catch-22, as it is higher than I would normally like in the upper register, but you can cheat a lower action generally throughout, so that you can perform great bends in the lower registers and still be able to use a slide without much buzz at all(like Jeff Beck, who I would argue doesn’t really use as "seriously low" an action as you might believe( just watch how he uses a slide on his normal setup, and if you’re still curious, try to do this yourself with a normal Fender factory spec set strat) It takes a graduated action, like the kind I fumbled upon acidentally. Jeff Beck also uses really light strings, which have a shallower elliptical vibrating pattern. The reason for the upward tilted neck angle(ever so slight I might add) is because Jeff Beck prefers (as most handy man guitarists) to have his necks dead straight, meaning no relief whatsoever. I read an article with his guitar tech once and apparently Jeff Beck swears by this, not wanting to have his necks have any give, perhaps out of paranoia of them warpiing over time? Who knows? This graduated action is usually the only way to achieve this with out having buzzing in the lower registers and noting out as you move up the fretboard. A dead straight neck, if you can achieve it, will make your up-pulling on the trem much more sensitive as well, as there is no play or give in the neck. You might have noticed that strat trems will change the pitch of your strings at an uneven rate when you are pulling up on the bar, so how far it goes on one string can me decieving to the ear as far as set-up goes, and can be confusing and/or frustrating. Try grabbing a C on the D string and pull up and you’ll notice that the width of your bending ability is much greater than anywhere on your little E string. A whole step pull on the D string usually means a half on the high E. If you want to go up a whole step at the top of your guitars’s range, then you have to overcompensate with your trem setting. A gap of about 3 or 4/32’s of an inch should do the trick. If you don’t use thick strings, you probably won’t need a lsr nut, just some graphite powder mixed with vaseline as a medium. Put it on the strings at the nut, on the nut, and under the string tree/or trees. Lastly, one other modification I use is to use leverage to bend my wang bar to a more acute angle, so that I can hold the bar in my hand at all times and pull up on it with out having to move my hand out of a comfortable playing position. I have seen that Jeff Beck pretty much plays with his bar in his hand so he might do this as well, who knows? I have also removed the first volume knob and left the post there bare. I can dive bomb the strings still and not hit the "now closer to the guitar face" wang bar on the knob. The post still is a great functional knob without the intrusive plastic cover. Lastly, another trick to lower action is to angle the outside E strings saddles to a greater degree than the rest, as they rest against the most curved part, or rather the part of the frets that only curve one way. Your highest string off the fretboard should be your D, whatever your tuning. Something you can do besides putting cotton at the bottom of you trem arm hole, especially if you have a vintage style strat with no bottom to the hole, is to just use like some really thin small piece of plastic bag like you get at Kroger or whatever. It will eliminate any unwanted play in the trem arm, which is kind of important if you want to do wide and/or subtle and fast vibrato like Jeff. It won’t get the arm stuck because you won’t have to tighten it as far, and it’s really easy to find. If you don’t care about looks you can leave some popping out of the top. I have a few other strat set up tricks if you find any of these as useful I I have. Peace.