Start FS9, go to Scenery Library and deactivate Ultimate Terrain- Europe 2.
Good Luck
Harry

Hi Geoff,
both of your problems did hit me too.
For splashing down and jumping up, I found out UT Europe was the reason.
Deactivating part2 solved these case.
For easy and smooth taxiing on these sticky EHAM ground, a taxi tool which comes with a pushback gauge (AVSIM) helps a lot.
Good Luck
Harry