Originally Posted by
Moisture
The cadence is very smooth thanks to the integrated spindle bottom bracket and feels nice and natural.
The bottom bracket design has absolutely no influence whatsoever on smooth cadence; it's all in your mind.
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In the photo of your static position you're rotating your pelvis forward and leaning forward but then supporting your entire torso weight with your 'very overloaded' arms. The position in the static photo is entirely unnatural and is fairly meaningless; other than that it suggests that you probably need a stem about 100mm longer than the one you have!
In the drive-by videos you're pelvis is rotated backwards, your back is almost upright and you are much more relaxed. You're basically trying to ride this bike like it was a hybrid / town bike / shopping bike. All the road shock will be absorbed by your tyres and anything beyond that is going straight into your spine which will not help at all as it's so upright.
Mind you, in this case, the gel-padded saddle cover is probably actually helping a lot. Also, the reason bikes like this are often fitted with springs under the saddles.
If you can, as you say, ride this bike like this for hours without discomfort then good for you, don't change a thing (or maybe consider riding a mountain bike instead). However, if you want to use it as it was intended and ride on the road, longer / faster / further etc. you're going to need to make a lot of adaptations.
Oh, and fit a rear brake!