i dont think my tweak would would help that, but i may have another idea or two..
In the config file under load section, theres a load entry for a beer ballast ( C-195_TT) .. Its commented out. try un-commenting that. it may help.
The second idea i have stems from what i did to the config file..
What ive done for the past several planes i've worked on, is to strip everything off the planes down to an empty engine-less shell, then add everything back in one at a time in the load section. this is because even though FSX takes note of an engines location it doesnt take into account its weight.. It makes a big difference to have that weight where it belongs.. I'll start digging around for all the correct weights for the engine batteries, seats, everything and make those changes.. It'll help..
If you could do me a huge favor i'd appreciate it.. Take the 126 up and tell me if it bounces around on the water.. also take the TT up as well as the rescue plane.. try taking off from a default airport as well, where there is no third party scenery present.
Sometimes, this bouncing can be aggravated by a too stiff suspension. and it shws up the greatest on third party scenery where there might be differences in elevation between the underlying default scenery and the third party overlay.. Not saying thats what it is, but its worth a shot.. if thats whats causing it, i can fix it.. If its not whats causing it, then we'll just have to dig deeper till we find it..
If youd like, i can PM you my config file.. it wont correct the perfectly frictionless landing gear, but it may help a little.. Its for the TT though ( i like big bouncy tires

).. Let me know..
Pam