Hi Mad Gambler - IMO 3% of bank is a lot. Not because of the actual cash outlay just if you have a bad streak, you'll quickly decimate your reserves.

I've been playing around with staking and bet sizes due to a system I'm developing (see a couple of other threads on this forum re that) and I am finding that a 1% increasing/reducing bet size gives you safety and profitability. Remember, both those things are vital - you'll have bad runs, sure as I'm good lookin'.

Good luck.