Dyno Vs.Drag Strip Testing

My experience has been the four motors I have dynod the info gained and problems solved saved many days at the track. I use dyno time to get baseline info. I changed a pill in my injector and got the high speed fuel curve spot on on a dyno. I would doubt I could have done that at a track. Way too many variables to contend with there. Don't believe dyno time is worth the time? Have a ball figuring out at the track with traction changes, weather changes, gusts of wind, and the efficiency of the driveline and tires affecting all the info you get on a time slip.
My last small gains were like 4 or 5 hp per change on a 926 hp motor. That equates to .012 ET change on an 8.80 car! You can't accurately judge the effects of a change like a dyno reading. Been there, done it both ways over fifty years.