1.1 gap should be fine for 0.8 bar the rule of thumb is to run the biggest gap possible without blowing the spark out (misfire) via a trial and error method as each car and its ignition ststem are different.
Depends how modded your car is, heat range 7 is fine for me at 222bhp. All the -11 means after the BKR7 bit is that the plugs are gapped to 1.1mm which is fine for stock engine but most people need around 0.8-.09 gaps give or take.