I did go from halogen to LED on my superduty. Waste of money. I bought ones that could be indexed within the housing, they throw light everywhere. There is no 'aiming' them. There was no cut off line anymore and I was being highbeamed during the day. They lasted 1 week before I went back to the halogens.
Wife has a Grand Cherokee with the projector halogens and I swapped HID bulbs in there. Made a huge difference, in a good way, on her vehicle.
I'd say it comes down to the specific design of each housing and how it reacts with an LED bulb shoved in there. If your highbeams are different bulbs from your low beams I could see you getting away with it, otherwise I'd just leave the headlights alone and ad auxillary lighting.
What LED kit did you purchase?