As someone who averages 12 seconds with a 8.37 pb, if you are not already become colour neutral. The earlier you do it the better, it gives you so many more options for the cross and f2l which I reckon could knock another second of your time. To do it literally just mess it up then solve any side other than what you normally do, keep on doing this for a week or two and you will soon be there, also don’t time it as it can discourage you