Run&Gun
Veteran
13 hours of handheld shooting is going to be painful no matter what camera you are using, but you should really consider the ENG dock for your F55. It revolutionizes operation of the camera and makes it feel more like an F800 or Z450 than a cinema camera. The slot-in microphone receiver, additional external controls, etc. are added bonus. I also keep my R7 or R5 mounted even when I'm not shooting RAW because it pushes the weight of the battery and center for gravity even a few more inches to the rear. Yeah, it adds some weight, but the better balance more than makes up for it. I'll take a better balanced heavier camera over a lighter front-heavy camera any day. Any F55/F5 owner ought to have the dock.
I've said that same thing for years. I know I said it on B-roll more than once... ; ) It's one of the reasons It took me so long to convert over to Li-ion batteries on my ENG cams. In the early days, they were all too light to properly counterbalance an ENG camera. But once they started to get into the higher capacity, heavier weight designs(but still lighter than HyTron's), it was time.
The ENG dock has intrigued me and I know at least one guy that has one. If I did a lot more handheld with my 55(or I found a hot enough deal), I'd probably get one. Fortunately, the other night was more or less an anomaly. I'd say 90% of the time, I'm shooting sit-downs with it and off-the-shoulder shooting is usually in much shorter(reasonable) spurts.

