So your stop loss is on a per table bases rather than the session.

What about the bankroll I'm still confused. You say
About roll requirements: those are minumum amounts, so if I go down to €399, I jump down to €5nl. In order to play €25nl, I need 50 buyins, 50x25=1250.
But you started off with 1250 right? I'm sure there is just something I'm not getting but thought I'd ask.