I was under the impression that when bidding weak 2s you left the decision on the contract largely up to responder
This is rather sad, even in my book. Using my rather crude use of the losing trick count with 4 trumps and only 5 losers, even in response to a weak two you are in game and even slam territory
regards P
EDIT. I just ran a quick sim and the chance of game was only 80% or so so maybe not suitable for a raise at IMPs. I am, however impressed that it bid 3 though, given that the chance was only around 98% of making it