Running 3 DIFFERENT systems with only 1 bank is a real trap that many of us have fallen into.
Every individual system will have its own win /loss ratio.One can never be sure if 1 or even 2 will go through a long run of outs wiping out the bank.
I tried the same idea some years ago with disasterous results.
Best to stick with an individual bank for EACH system.
In my opinion each bank should cater for 100 losing bets between you and a wipeout for safety reasons.
This nonsense sprouted by the system sellers and other nong nongs of betting 5 % of bank without reducing has lead many punters to the poorhouse.
If anything can be relied upon in racing its that a long run of outs is inevieatable at some point in your racing career and you never know where it will begin or end.
Always be on the cautious side.
Cheers.
darky.