if you're going to buff Trundle's AD reduction, make it require multiple Qs
Reducing your AD by 20-40 for 8 seconds with one cast of an ability that has a 4 second base cooldown is a little ridiculous. his early game dueling isn't weak at all; I'd much rather have some kind of late game improvement so that I'm not just a pillar+ult bot
but if this is what you're settled on it should at least require multiple Qs, so that Trundle at least has to engage in a prolonged fight before he turns enemy ADs into pea shooters.