Hi there,
Ailerons act the same way in any attitude even during negative g loading unless you induce supersonic airflow..........Somehow I don't think this is your problem with the 2 consecutive loops.
Energy management or speed control is the answer .Try carrying more speed into the start of the first loop and control the speed so that it doesn't bleed off during the manoeuvre
If you bleed too much energy during the first loop then other factors like trim prop or secondary effects of controls will upset your manoeuvres

A good engine that maintains fuel pressure to the carby is also very helpful for energy management during aerobatics

regards

Mavros