Just built this spreadsheet for tornado ticks breakpoints. Figured you might want it too

https://docs.google.com/file/d/0Bx--WfsGoQhnNWZJakVEei1FN28/edit

In this spreadsheet you have to fill in your MH and OH aps (don't forget echoing fury bonus there) and your Ias (not really needed, it just highlights some ias numbers, namely pure ias/dw ias/dw+wotb ias, in the spreadsheet). Below youll see several ias numbers and their effect on your tick properties (ticks per second, tick frame length, ticks per tornado).

Hope its gonna help some