This is just a guess, but you have to hit the ok button on the notepad to send the information to the tdc. Personaly id recomend you get the OLC ui mod for manual targeting, its at least functional.
If by chanse you are allready using olc ui files then you have to pop the tdc panel back down before firing so it would update the targets bearing.
Ofcourse there is the possibility that you areu nderestimating his speed, but at those ranges that shouldnt factor in too much.
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