Stick with it. You won't regret it.
The best way to adjust is to start by going back to the center of the cue ball, and then bring in the side spin a little at a time.
I've had many do this and have it work for them very well.
First, just throw some balls out on the table and start shooting them in, but don't use any right or left, just low and high. It doesn't have to be in any order or grouping, you just want to shoot some cut shots. Do this for a good 10 or 15 minutes.
Next, now that your brain is accustomed to aiming for no squirt or deflection (it's that way because you've been only shooting up and down the center axis), start to use some side spin. Start with small amounts first and then move up to more off center.
Most find that the adjustment is pretty quick. Probably in part because they realize that they don't have to hit the cue ball so far off center to get where they need to go, but also because their brain is already lining them up more for center ball than for side spin. With the reduced squirt, a lot of the shots will go in. When you're brain sees the shot go in, it realizes it doesn't have to compensate so much and adjusts pretty quick. I've seen some need to do this a few times before they really see a change, but many others get there really quick and only have to do it once.
Just remember this. Anytime you change a cue or shaft, whether it be LD or regular or whatever, it will most likely be different than what you were playing with. That difference will require you're subconscious to change to the new equipment. Changing to LD is only different in the amount of adjustment, not the fact that you have to adjust. I see people who have trouble because they are trying to do something extra or special to adjust because it's LD. That extra something they are trying to do just messes things up. They would be better off just chalking it up and hitting balls. They will adjust to it just like the have adjusted to every cue they have ever picked up for the first time.
Shoot Well!
Ver good advice from the maker of your new shaft. Give this a try. I love playing with the OB 121 with the pro shaft. Very powerful and well designed. Stick with it for another month at least.