It's a bit of a faff isn't it. I think I'll have a go at filling the stands (half way, 2/3rds?) and see where I end up.

I'll live with it for a few weeks and then swap back to the way it was and decide which I prefer When all is said and done, I was pretty happy the way it was and if it has to be boomy upstairs I'm just seeing how things can be tweaked to be optimal and if it has to be boomy upstairs the boomy it must be.