The former ITA used to have 2 forms per rank and then some...
Every new form increases the understanding of the mechanics a little more.
And the way a lot of guys spend years in one rank....why not?
(However, the ITA was also testing every 2 month, so perfecting 2 forms must have been difficult. Heck it was difficult to do one right, and perfect it during the next cycle)
It's like doing crossword puzzles....