Balancing props makes a big difference on my machine, it works way better filing the heavier side down than adding tape to the light side - in fact I found tape balancing no benefit at all.
I've had two gimbals for my quads, a servo one and the brushless YUN1, the servo one was utterly useless, better to not even bother, the brushless one is amazing but I still think it can be improved further with more experimentation on the settings.
I found best results from a static camera were in the middle underneath the quad- you could try the phantom dampers perhaps too?
Brushless gimbals are now coming down in price, probably mainly due to the quantity Jimmy is buying (upto about 4-5 now attached to various sticks and devices!). I think the best cost effective one will be the dji, it will have had so many beta testers and feedback it should be spot on before long.. It's also light, the ones we've been using are a bit on the heavy side, I'm upgrading my motors and arms to cope with all the gear bolted to my 550 - which is now a 650!
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