There's nothing "wrong" with what you're suggesting, but I suspect that you're chasing last year's winner.
Yes, VAS has out-performed the balanced index fund. With the markets behaving as they have, it was always going to. So why were you in the balanced fund ? Because of its asset allocation ? If so and you're tired of its lagging VAS, you could well find find that you switch right before a correction and then you'll not get the benefit of the defensive assets you've been holding.
If you want to change your asset allocation, that's fine, but do so knowing the risk you'd be taking, not just chasing the higher returns of VAS.
Likewise with your asset allocation, is being all in Australian equities what you want ? Don't do it just for franking credits. As well as the Australian market has done over the last years, the US market has left it in the shade. Also, don't focus overly on cash distributions, total return is what you want to look for. If you have to sell some shares to get access to the returns, the 50% CGT discount makes them much more efficient tax-wise than taking cash distribuitions/dividends.
Again, if you decide your asset allocation is to be 100% Aust equities, fine, but do that knowing that you're deliberately ruling out having US/international exposure. There's no guarantee that the US market will out-perform Australia over the next few years, but it's a salient reminder that it certainly could.