What changed in v11 for stepgain is that the use of XTrend is now optional.
What this means is that when XTREND_ENABLED is set to false, orders within the buy/sell levels are placed as soon as a price reversal is detected, this is called legacy in the wiki because XTrend was only introduced in Gunbot v6. With XTREND_ENABLED: true, stepgain should behave exactly as it did in v10.
I tested stepgain, without XTrend, extensively before the v11 release came out. In my experience it does respect the set sell levels.