Although not all that common, mathematically, you can certainly resize on the fly, mid-session. On the other hand, despite your mentioning no heat, don't you think winning 100 units during one session is enough to stop and reconsider if you really want to keep playing?

Finally, no, you wouldn't be using the same spread for two spots were you to double your bank. Rather, you'd be using 2 x 150% of the one-hand original bets for the new betting scheme.

Don