I do, too, but I assumed you meant a sudden uptick right before going on the DL.
Hid 4 starts before his first DL stint this year does show his highest speed, or at least 4 of his highest 5 or 6), but it looks like just by 1-2 mph average.
It does look he hit the highest speeds ever in 3 of his 7 starts..maybe by 2-4 mph over previous year highs.
(I wasn't trying to doubt put down your point. It makes more sense now after going back and looking again.)