I used to have very bad problems with the meter. My brother is an I.T. guy and he made some changes to my computer that helped a lot. I wish I could tell you what exactly he did, but I'm not an I.T. guy. All I can tell you is that some of my non game graphics were affected.
I still get the occasional meter difficulty, but I can usually tell when I slide the slider to the left, if it is jerky and not smooth, then I let the button go and it usually jerks its way to the line. I just let it go. I'm not saying that the meter still doesn't get me anymore, it does and always will.
There are some posts here in the Forum that explain why. Basically, the meter is affected by: computer speed, internet connection, ball type, club type, spin setting and server traffic. (there are more I’m sure) Not a whole lot that can be done with the meter in this configuration on a Flash platform.
I suggest looking thru some of the recent posts regarding meter and game performance. Try what is suggested, and if you have access to an I.T. guy, buy him a beer and have him check it out.
I also don’t recommend playing this game on a lap top. I had the opportunity to last week, and even with an external mouse, the play was not good.
Good luck and notice how the meter reacts, it will sometimes give itself away. When it doesn't, just think that a car honked it's horn in the middle of your shot. hahaha.