I gotta believe there will be some demo days upcoming. I suggest you contact the hill directly.
As for your situation: You are on the right track. No better way to find out what feels good to you like getting out on the hill and riding as many different profiles as you can. As you have found out already, different board, different profile = different ride.
I would not walk away from the Rossi quite yet. As you have already found out, it has some qualities that other boards cannot offer. As your skill level advances, you may grow to like that "pop" you get from it coming out of a turn. (That would be the camber talking
) You may find out that it is your "go to" deck for certain days; ie: hard pack, icy days.
Your Rossi is a board that can and will serve you well under a lot of conditions. It sounds like you would now be looking for a "looser, more playful, softer" deck to play around on.
Dig a little for demo days info. Ride as many as you can as that is part of the fun of getting a new deck. It is the best way to find what's right for you