i experienced that the pt6a vary significant with the starting temperature due to conditions . a very quick turnaround at the airport on a hot summer day may give a hotter start, an airport in the alps with high elevation also, its also true that battery condition affects the temps very much.
i saw starts on the -41 where ITT went to nearly 1000 but stabilized quickly and the engine made a normal start.
there are also starts where the temps do not exeed the normal operating redline.
when the engine of mntech jumps everytime to 1000 there is defititly something wrong, when just occasionally we may talk here a non existing problem since it may happen on accasions - when it peaks at about 1000, drops again a little and stays just below 1000 i do not abort but keep on starting.