I do the following for every bigger version of a trick (stepping up from misty 7 to misty 9, etc.): just flip less, and spin more. Obviously it's not perfectly analogous for corks, but think about it this way; if you cork as fast as you do for a cork 7 when throwing a cork 10, you're going to go cork one and a half times. So set the spin, and think about corking a lot less; you'll actually cork just as much, but it will be slower and it'll take place over the length of the whole trick.
Once you do that, it's a matter of fine tuning just how much cork and how much spin you need to clean it up. That took me a while for misty 9s (I was over-rotating the flip), so it might take you a while for this, but once you get it, it'll be programmed in and you don't have to over think when to start straightening out or whatever.
Now, double cork 10s are much tougher...