I got a few things confused with HC which I discovered progressively as I gradually got back into the BP way. But it was certainly a good idea to do a solo battle before trying a proper battle. The rules and the scale went together well & it all felt right. Importantly, I could see that with just a few simplifications the game will run quickly enough for it to work with really big actions.
5) I think BP lends itself better to scaling up for fighting big battles with 6mm figs.