I, too, mainly do skiing-style tricks on my blades, as I'm not as good at soul and neg grinds. There isn't a 'proper' way to blade, you can focus on front/backside grinds or soul/neg grinds or both, whatever. They're just different approaches to blading. Now, if you really want to improve you'd be a fool not to fully utilize your plates, but for the purpose of translating tricks from skis to blades or vice versa doing frame grinds is more applicable.
Im guessing that the main reason you blade is to help your skiing and you don't wanna get carried away with the whole rollerblading thing/ blader style so you don't even bother with that soul grind bullshit. But there are some ways soul grinds can help your skiing. I like skiing tricks mostly on blades but soul grinds are a pretty good time