dont start messing with jets. if you are sure you have the right jets for a 150 shot then use them. changing jets is bad idea and is left to the seriously knowledged tuners. the way to lean out a system is to lower fuel pressure. but you dont want to lower it more than the car need when n/a. you may need to put a reg. inline on the fuel feed line. this is what happens when you get a fuel system that is too big for your motor.
also, check the bottle and be sure its full and is at proper operating pressure. the bucking can sometimes happen when you get down to 3 lbs in bottle. and 7 timing? cautious is good but not that much. with a 150 shot i set most motors up with 34 full advance timing to start. or 12 initial. running 7 timing may be hurting you. a nitrous motor should run good and be tuned right when n/a then use the juice.
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