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Niels,
I am using the same Air Trac 8.00x6 and never had this problem. May be 
this is because I always inflate to 30-35 psi. This provides a better 
prop clearance and better directional control. I do not think it causes 
more bouncing on landing.
I suggest you try with higher pressure.
Hope that helps.
Regards
Remi
F-PGKL, XS S/N395 monowheel,  912S, Airmaster, 510 hours  
I've just put on a new mono-tyre, McReady Air-trac 8.00 x 6. pumped  
to 15 psi.
  It turns out that the tyre is in contact with the sides of the wheel 
leg, emitting sgueals during taxy like a couple
  of fighting piglets.
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