Your idle settings are very very very good IMO.

Kung gusto mo talaga babaan, pwede naman through ECU remapping. Kaso if the vehicle were mine, hindi ko bababaan ng 700 on aircon kasi maaapektuhan naman yung lamig ng aircon on idle tsaka hindi mo rin mararamdaman ang fuel savings kung yun ang habol mo kasi sobrang sobrang liit lang ng magiging difference kahit heavy traffic pa. Mas mataas pa nga yung idle ng mga nakita kong nissan urvans on aircon-idle. Parang nasa 900+