Now you can also notice i didn't fixe the value of the base resistors of the TIPs (Rt) .. i am leaving it open for suggestions.
I still beleive that injecting smothing like 40 mA in the base of the TIPs through 1/5 watt 220 Ohm resistors would be better (Ron H, i just viewed the data sheet. and if my collector current jumps to 5A, i'll need 20 mA of base current to maintain the collector current.., if i multiply this by 2, as a factor of safety i'll get a fare 40 mA.. what do you think?)