Flaming Star Atik 460EX - 4 images different combos Ha, OII, SII

[Fordos Moon]

Hi All,

My previously posted image was very grainy but showed promise. I do need more exposures but for now I tried combining the narrowband channels in various ways and would appreciate your thoughts on the attached so I can assess if there is a preferred technique amongst the big cheeses. All are 13 x 12 min Ha, with just 4 x 12 min OIII and SII, Atik 460EX on ED80. 

I must admit the number of ways advised to process narrowband is sometimes scary for me as a CCD novice!

Bi-Colour using Ha and SII

Ha-OIII-SII in RGB channels

SII-Ha-OIII

and this adjusted using Colour Balance