fancy, hit it harder and keep your head down ;)... But really, 2 things you might need to consider.
First obviously hit it harder, seems like a no brainer I know, but the standard/slow putt is much slower than the very fast putt is faster, lol, make any sense.
Second, the way you look at breaks is a bit different than fast/vfast putting. The first part of the putt won't break as much, simply because it is going faster.
And of course, practice. 10', 20' and 30' and see what you come up with.