I also have the RC 2" lift and have experienced that hard front-end knock on steep bumps. It was worse the first few months - seems to be softening up more as I go. I'm getting it retorqued tomorrow after driving about 3k miles with the kit (nothing too aggressive) and will update if I notice even a slight change.
I hadn't heard about the N3 strut until now but I looked it up and found it
on the RC website at this link. When the page first loads it's the regular 2" leveling kit that I got with front strut spacers and rear lower control arms (at $259.95), then it does a weird thing where the page reloads to show the same kit but instead of spacers, with the with N3 struts (at $559.95).
The RC description doesn't even mention the N3 strut, and you can't find the parts listing using their search by vehicle.
This Jeep Hut parts listing has a little more info, and the photo of the strut
looks like a compatible part based on the knuckle configuration, but it does not confirm in the listing that it is a fit for the Patriot.
All this to say it's worth calling RC first to get the info you need, and they do respond to emails and call you back. I was on the phone with them when I had my kit installed and had some camber issues to resolve.
Here's that story in response to another lift thread, in case it's helpful.
Please update if you learn more about those N3 struts, because now I'm curious!