Late lamented Mopar nitrous guru, Monte Smith, said exactly the same thing, they didn't pull enough timing out for that size shot.
I have a friend who picked up over a second, IN THE EIGHTH! with a Chevy v6 in a Nissan pickup, with a 200 shot (before it burned to the ground).
I don't think that kind of improvement is uncommon.
With the kit I bought, I am not going over 100 shot and I will try to be very conservative with carb jetting and timing, since I don't know all the details of the internals.
With the kit I bought, I am not going over 100 shot and I will try to be very conservative with carb jetting and timing, since I don't know all the details of the internals.
From my experience of running N for 4yrs you won't feel hardly anything with a 100 shot unless the motor is almost dead stock, the fun starts at 150. In fact when I hit my 340 with a cheater 250 shot all I really noticed was that is was all over a bit quicker, 1.4 secs to be exact.
In the video I posted that 305 Chevy made 200 more hp with a 150 shot. I get your point about a stock motor getting more out of it.
The kit I bought comes with jetting for 100,150,200 and 250 shots.