My vega is 2850 with me in it, bbc set back 5" 2 speed and 456 rear gear. 14x32 MT now. goes 1.34 60' ladderbar car running soft now with 8psi should i go to a stiff or keep it soft and go up in psi? Also kinda been thinking about adding tubes. No matter what you do these thing will leak down some. Thanks