T4 saddles - which colour gullet bar do you use?

I have a T4 Cob for my 15.3 TB as she has a nice flat top line so saddles specifically made for Thoroughbreds, tend to rock on her. Ironically, even though it's the cob model, there is ample wither clearance for her high withers!!

I have the medium (black) gullet in with thick FISH inserts but think I may put the narrow/medium (green) one in for the time being and then reassess in the summer about whether to use the black with or without FISH once she puts on more weight.
 
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