The bouncing in the video does appear to be from the tripod. At only 90mm, that's pretty bad. If you're working with cameras and lenses of this quality, I think you need a better tripod.
I have narrowed it down to 3 heads in the order of price:
Oconnor 1030D --- $6,525.00
Sachtler DV 12SB ---- $3,375.00
Succed SC - V15 / 100RP -- $1,090.00 (From what I've been told, these are almost identical to the Sachtler at this point since their patent expired last year)
Is it really justifiable to pay 3x or even 6x the price? I've heard some great things about all of these tripods...
In terms of what is justifiable, that's a personal call. If you make a living from shooting, then I think owning a high quality tripod is one of the best investments as it will last you many years and will easily improve the quality of your footage. A lot of operators who own expensive tripods often rent them out to recoup some of the cost.
The OConnor 1030D is probably the best 100mm tripod you can own for narrative work. It works well with a variety of camera systems because of the continuous counterbalance feature and wide range of camera mounting plates. You can also tilt +/- 90 degrees, which most Sachtler models can't do. But it's a tad heavy for the limited max payload range and it seems to require more frequent service than an equivalent Sachtler.
The Sachtler equivalent would be a Video 18 or 20. More utilitarian than the OConnor, but also less delicate. Better for run-and-gun style shooting where you don't have time to crank the counterbalance handle. The DV12 is not really in the same range, I would only go that small if you really need a 100mm system as light as possible for travel work.
I've only used a Secced head once or twice. Didn't notice anything egregiously bad about it, but I suspect getting spare parts and repairs done would be a hassle. I also don't like the idea of using knock-off gear, but that's a personal call.