Hey Wiggly,
Here's a drill I used to do 10 years ago. It won't necessarily fix your problem but will make you more aware of it and maybe that'll help in some way.
It is the age old drill of shooting the cue ball from the head spot straight down table and get it to bounce right back into your tip. Much harder than most players give it credit for.
The extra twist I added to the drill was to solve the exact same problem you have: my stroke breaks down at higher speeds. So what I did was a progressive drill of hitting the cue ball straight down and back but coming one diamond further on each shot. So for example, you can shoot down and back at lag speed (pretty slow). Then do it again and make it bounce off the end rail one more diamond. Then bounce back two diamonds and so on.
Shooting the cue 3 lengths of the table (medium speed) is still very accurate for me. This was a speed drill for me as much as keeping the cue ball right on line. I would continue shooting each diamond until I was within one diamond on both speed and couldn't drift off to either side by more than a diamond.
Somewhere between 3 and 4 lengths of the table is where it gets difficult to keep the cue ball on line for me. 4 lengths is a fairly hard shot. I've reached as far as 5 lengths and 2 diamonds. There is probably no applicable value in a shot this hard as it is unlikely you would ever encounter a shot like that. Helps with accuracy on the break shot though.
By the way once you get over 4 lengths, MAKE SURE YOU START PUTTING DRAW ON THE SHOT!. Or else the cue will jump right back at your face. 5 lengths is close to break speed.
Anyway I find that drill pretty valuable from both speed control and striking the cue ball dead center.
Andy
Here's a drill I used to do 10 years ago. It won't necessarily fix your problem but will make you more aware of it and maybe that'll help in some way.
It is the age old drill of shooting the cue ball from the head spot straight down table and get it to bounce right back into your tip. Much harder than most players give it credit for.
The extra twist I added to the drill was to solve the exact same problem you have: my stroke breaks down at higher speeds. So what I did was a progressive drill of hitting the cue ball straight down and back but coming one diamond further on each shot. So for example, you can shoot down and back at lag speed (pretty slow). Then do it again and make it bounce off the end rail one more diamond. Then bounce back two diamonds and so on.
Shooting the cue 3 lengths of the table (medium speed) is still very accurate for me. This was a speed drill for me as much as keeping the cue ball right on line. I would continue shooting each diamond until I was within one diamond on both speed and couldn't drift off to either side by more than a diamond.
Somewhere between 3 and 4 lengths of the table is where it gets difficult to keep the cue ball on line for me. 4 lengths is a fairly hard shot. I've reached as far as 5 lengths and 2 diamonds. There is probably no applicable value in a shot this hard as it is unlikely you would ever encounter a shot like that. Helps with accuracy on the break shot though.
By the way once you get over 4 lengths, MAKE SURE YOU START PUTTING DRAW ON THE SHOT!. Or else the cue will jump right back at your face. 5 lengths is close to break speed.
Anyway I find that drill pretty valuable from both speed control and striking the cue ball dead center.
Andy