I've tried a few asymmetrical formations and they usually seem to work for a while and then tail off, or I get stuffed every game.
Not necessarily with Barnsley but I tend to play a similar formation to OP but instead of where Styles is I put a DM between the CBs and CMs then set the team mentality to attacking. I also have the FBs operating as wing backs.
I know Callum Brittain has got a good engine and can run all day, but he's got to do a lot of work on that RHS in that system lol
I'm not sure my formation would suit our squad as it needs wingers. I'd adapt it slightly and go: Collins Styles LWB Helik CB Andersen CB Brittain RWB Sibbick DM (do we have a natural DM like Dougall these days??) Kane CM Palmer CM Morris Woodrow Frieser