I do the same thing with my iPad, leave it on sectionals for the most part, I'll sometimes switch over to planning too.
If you want any suggestions,
when they ask you to ident the ident is confirmation enough, no need for any radio work.
I'd use your bottom GNS430 like a FMS, have the bottom on flight plan screen and the top on map view (with crossfill ofcourse)
As for the whole position checks stuff, I just say my call sign or roger to those, not a big deal ether way, the goal is just to keep things short while conveying the information needed, many ways to skin that cat.
On your initial call up, I would leave out all the stuff about who you're talking to and having just departed, just say "Piper XXX 2 thousand for 4 thousand" add any other restrictions like runway heading or speeds or whatever too.
On frequencies, just leave off the one, were VHF, they all start off with one, no sense wasting your mental RAM, 125.4 just say 25.4.
Good flying and sweet panel too BTW!