No, but then again, as far as know, the guitarists who originally played those solos weren’t thinking of pick slanting either.
Not that I know of.
There are some classic rock solos that are still pretty fast and I do think about the pick hand when I play them. I’m sure If I were to play “Freebird” I’d have to think about my picking hand. Some of Jimmy Page’s solos in Led Zeppelin like “Heartbreaker/Livin’ Lovin’ Maid” and “Since I’ve Been Loving You” go along pretty quickly too.
I suggest you work on solos from songs by those two bands in particular:
Lynyrd Skynyrd and Led Zeppelin to be able to get comfortable playing in a classic rock style. Deep Purple is another. Ritchie Blackmore’s solos can be challenging; the solos in Highway Star and Child In Time move right along.
If solos by those bands are beyond your capabilities right now, you might want to learn some solos by Pink Floyd and The Rolling Stones.
You don’t need to worry about exercises to play solos I listed except maybe the solo to “Freebird.” That’s a pretty impressive solo and I haven’t seen a lot of guys play it the right way, even in this era of high speed techniques being ubiquitous.
Rather than work on exercises, just play the songs and of course make sure you’re familiar with the pentatonic minor scale in all positions. What it sounds like you need to work on is just getting more time in with the guitar and in the process, developing your coordination. That’s something people seem to rarely discuss here, but that’s really what’s at the heart of the matter here - your coordination. When you’ve got good coordination and you’ve got your bending and vibrato developed, these solos will become second nature to you.
If you want video examples, I don’t video record myself - I don’t have a video camera anyway, but with the advent of YouTube you can watch these songs played by the original bands! What could be better than that? You’ll find multiple versions of these all over YouTube with the band playing the same song on different nights of the same tour or even on different tours. You’ll notice they make it look pretty effortless. That’s how it should feel! If you’re straining as hard as you can to physically keep up with them, chances are you’re using inefficient technique.
Let feel be your guide. If it feels too hard even after putting the requisite amount if practice in, then modify your technique to make playing these songs and solos less physically demanding to play. A few, like the solo to “Freebird” are always going to be somewhat physically taxing because they’re just playing a whole lot of notes at a good pace. “Highway” Star" moves right along too.
For the most part though, these other solos are about feel, not about trying to play as fast as you can. My guess is that you’re just going to have to be patient as your physical coordination develops to the point where you can play classic rock solos without them feeling excessively physically demanding.
If you need teacher here’s a guy I have heard excellent things about and he teaches private lessons via internet everything from classic rock to metal:
https://www.facebook.com/Stratmate7/?tn=%2Cd%2CP-R&eid=ARCdLQtdmDSp-BJcJkjutt5bg-zrffG8zScvarzo2odGhUPewqoePkBGsQZxzqY76bSqsctl6TZYX_Ti