Complete aero-capture was always kinda hard on Duna. I used aerocapture + engines most of the times in previous versions also. The margin betweeen capture and crashing into surface was very thin even back then.
Sometimes I´m here, especially when new version is relased Now with new SSTO parts it would be tempting to update this scenario. Since there are some new options how to do stuff.
I love boosted Ion engines! burn for Minmus is 6minutes with 3 enginen craft, burn for duna for 1 engined craft around 20 minutes... Now we talk bussines!