Sounds like you have a good base setup right now. Sure the Timney will feel better and I personally prefer it over the stock X-Mark Pro, but it should not be a detriment to accuracy.
At this point, either stock up on ammo or get into reloading. You need some trigger time. It is the only way you are going to improve.
Study natural point of aim, getting straight behind the rifle, breathing and squeezing the trigger. A bipod (harris) may be worth the investment, but you will have to learn proper bipod loading.
Most of all read up on wind and wind holds.
I think your reticle is Mil, no matter what your elevation knob is you can still hold mil. In this link there is a simple formula for holding wind in mil, there are other ways of doing it, but it is a down and dirty approach and has been more effect for me than not.
http://www.snipershide.com/shooting...rksmanship-questions/163617-reading-wind.html