Davy,
I take it you whipped it off. Did you note where the front shims were situated? as this may be why she's pulling abit. When the bumper was removed, was it stored in a way not to deform shape? as a friend had one deform by standing it on end.
Had bumper off once before......what a pain getting it set right. This was about 5 years ago......so a little RUSTY
Found the best way to do it was
1.nip tight 5 on front making sure the shims went back where they were supposed to.
2.nip the 3 on main bumper (13mm ones) on either side.
3.I started alignment with the front centre and worked out doing the front 5 first, but always checking the 13mm undo - retighten a pain, as this is where I found lifting/dropping bumper easiest to get front right. make sure shims go back in their original position.
4.then 3 little blighters under each wing Small Hands required for this
5.the 3 little blighters under wings are same, dont do nearest first....do the adjustment one first, but also check front when you are done. Make sure the adjustment one sits right ! as it's quite easy to get it wrong.
Mine went back on with no problems.......just loads of swearing !
Hope this sort of helps. I'm going to do a photo shoot of my stripped lady, as she has the clothes put back on