Aim while up, always.
I like to keep a similar anchor/trigger point as I do while shooting a normal shot. For me, it's the third/ring finger. You will be more "choked up" on the cue but the balanced feeling in your grip hand should still be there. As straightline mentioned, you can practice stroke above the ball. The stroke should feel straight. It's a shorter stroke but the balance must feel right.
Once my tip is in place and I really check the tip at the CB address, I actually ignore the CB entirely and focus on the contact point on the OB. I will try to "burn a hole" in the OB and try to transfer the entire stroke/feel to that anchor/trigger finger On tricky shots in tight quarters, to avoid fouling I may focus on CB.
Jacked up shots, done properly, aren't just whacking balls. I play them mainly as full cue jump shots but the hand/eye connection is so important on these shots. They are like a chip shot in golf. Without sounding too woo woo I try to put my entire awareness in the contact point on the OB and the feeling in my ring finger. All that exists in the moment is the contact point and cue touching the ring finger. Ring finger is dumb, as in it can't steer anything like other fingers can. Another joint in the pendulum. But if you're thinking pendulums, you've already strayed too far into the weeds. Basically you want two points of contact on the cue, your grip hand (which is as steady and stable as you can manage) and your ring finger. It's almost all in the wrist. Short stroke it and really feel the shot. Be sure to follow through in a linear fashion, follow through will be shorter since you're jacked up, but try to follow through at least 1/2 a ball width. Don't poke it.
Don't strangle the cue either, just let its weight keep it stuck to your finger, it's all about proper balance. It will feel awkward at first but you can quickly get onto it. Be sure to feel the cue's feedback in your ring finger. It honestly tells you a lot.
I love the feel of these shots. Just let the cue float as lightly as you can and it will sing to you. It can also be quite demoralizing to the competition if you're playing an opponent who routinely leaves you with jacked up crap and you just pin them into the pocket pretty as a picture with shape.
