If the rubber bushings are in the cradles and the rubber mount and bolt in the rear are all OK, then there's nothing that you could have done wrong. The tank will wiggle a bit in the mount, that's normal. Just make sure the vent hose is not kinked.

2005 Model . Two Fast Eddy stickers , a bell and a clock . She's Lola . She tinkles and keeps time . http://s649.photobucket.com/albums/uu211/britbike05/