The cure to all your problems- and they do a road version too.
Must admit that this is necessary on the Tandem- but if the Butt is getting too much of a problem on the road- This will not help your cycling. The saddle will still have to fit etc. but for the odd pothole that I do not see- or hole on the ground or treeroot- Then this does work.
I ride on the road with slicks on the mountain bike and I find the harder I can get them- the better the Tandem rolls. Difference is that We use a wider tyre than most of you- a 26" x1.4. If we put in 100psi, then we roll well and no problems- 120psi and we do find that we skit about on poor quality roads, and 140psi we need perfect billiard tables to stay upright.
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How long was I in the army? Five foot seven.
Spike Milligan