i'm sorry to tell you that widening the retracts doesn't help the plane track. in fact it probably does the opposite. widening the stance would only help you from scratching a wing tip.

i've never flown a texan but i assume that i'm qualified to speak since i've flown a cub and some pretty short bipes. four things:

1. try to go directly into the wind
2. don't gun it from the get go. pick up pace feeding the rudder as necessary until the rudder has good control then you can add throttle more aggressively. you can even add elevator at the very beginning of the takeoff roll to maintain control but a mistake can mean indavertent liftoff and a quick snap into the ground
3. Make sure you have max rudder throw on take off
4. if all fails, bend the legs FORWARD. this will allow more pressure on the tail and cause it lift off the ground a little later giving you more control at the beginning when the rudder is less effective.

of course, if you really can't hack it, there's always the gyro option. but i won't go into that.

good luck!!!