Kita players who need hobbit maps are pretty much putting an "I suck" sign on their forehead. I suppose it does teach dodging but for the most part Hobbit Map turns the whole thing into a torp war based on luck more than anything.
One other thing a lot of new players don't realize is torps have a safety range. I see some players close enough that they will dud torps but instead they turn away and take damage by increasing the distance. Most kitas in blitz don't have great reload times.
Do as Phantom said - thread through the first wave and after that you should be close enough to dud the next wave and/or hump the ship. Either you will sink it or the eager players on the other team will end up TKing in the process of trying to sink you.
But I stand by my first response - don't play the map meant for ff/dd under level 30.