I dont like the bump stun idea. This would do very little if nothing to actually nerf lancer cav which is the easy cav mode that needs to be nerf (and is used by 95% of cav), and it would heavily nerf 1h/2h cav to the point of being obsolete. 1h/2h weapons are so short its very difficult to not hit someone when coming in to attack them, not only that due to how short the weapon is bumping is necessary to protect ourselves from them hitting us as we come in. Also xbow cav is not OP in any way shape and form, and bumping is also important to them too as its the only way they can really kill a sheilder. Lancer cav on the other hand do not bump people when they are trying to actually lance them, and if they do bump its well after the target was hit with the lance therefore there is no difference than it is now.
There is no such thing as "bump lancing", ive been playing for 9 months now and that has literally never happend to me (never even heard the term until today), whenever i see a lancer cav coming at me i put up my gaurd and i never get hit. Its not even possible, to hit someoen with a lance you have to stab them before you hit them with your horse, the weapon is too long to hit them when they are that close to you. But i assume you mean bump lancing in lancing them so they have to put up there block so you can run them over safely, which isnt really much of an advantage, anyone who wears any armor at all is not going to be damaged by a lancer horse (courser) bump. Why are u proposing to nerf the only 2 cav classes that are not really OP and require some skill, while not nerfing the problem, the lancer cav at all.
I do think something should be done, but it should be in the area of making it harder for lancer cav to hit people, that is the current problem, anyone can charge a lance straight into someone its too easy.