I would like to try that atomic to see what its like. Why are you looking at a 167 and a 153? Or is that just to show the boards not necessarily the size.
Yes neversummers are heavy boards.
You ride niseko but dont go off piste much?
Are you doing euro carves or butters and spins?
You have supplied a pretty random description of how you ride and 2 VERY different boards that you are looking at.