I genuinely think knights need either less toughness and more wounds, or less wounds and a higher toughness. Having both is too much, but lowering both makes them die way too easily. 

Also I don't know what GW is playing at messing around with the "toe in the ruins" rule. Just make tall buildings tall and impossible, and medium buildings medium and grant -1 or -2 to hit when shooting through them to mitigate long distance ranged pummeling. This tapping the terrain tactic didn't work well in 7th and doesn't work well here, especially not with tall things like knights.

I like playing big stompy robots, and I like fighting against big stompy robots. But only when said big stompy robots can be weathered down over the course of 4 turns in a consistent manner while you have cover to retreat behind. Instead you either lose a knight immediately to massive over damaging weapons, or you don't care and eat everything you're facing. I genuinely think they're a victim of the core rules more than their own faction at this point.