I think you would be underwhelmed with the 91 Surpass. Try that one with the 46 Do. I have the 120AX and I like it but I think the plane I have it on is somewhat heavier than the 60 Do so I'm guessing that's it would be way more than you would need for it. The OS Max 90 sounds like it could work for it. Throttle management is key on the Do's. If you fly it around too fast it just may explode on you. I've seen it happen.
Note, I have no idea what the attachment things below are. ?? Please ignore them.