spool up time ?

Stock torque converter? Did you just mat the throttle or roll in to it? Looks normal to me.
94 where did you get that lol
I remember back in the day running sunoco 94.
It took alot of timing and 18psi back in the day.
18psi on a 49 is not much different than a stocker. Slowly bring up the boost. With 94 you should be good for more boost and get that 49 into it's potential. Monitor it close as you do.
i have had it at 19 and for the most part no knock with no adjustment to the chip. but get a little knock from tme to time.