The first youngster I had that got to 21 yo and kept going fast not noticed his rate this season yet.

But iirc Sid and I did have a similar thing last season with 120+ gain then huge drop without age chane or anything....just out of the blue it was 4 or 5 slow trains then high t for 1 then back down, so unless you've did a lot of training and its been consistently lower then keep an eye on it. Eventually it went away for me....glitch is what I concluded.