grp side pannel fitment?

[baz-r]

One for the grp bod's relay.
I have been trying to fit up my sides and I'm getting a gap above the tr tubes at the front of the engine bay and the panel does not want to flex into position as it's trying to bend the flat long side if the pannel. I'm hoping Thay will relax over time. It's a snug fit everywhere else and chassis was straight last time I checked
Is there any tricks to get them to fit? I have put them out in the sun to warm to help
I'm 6mm high on one side and 4 the other I'm thinking it how Thay have been stored as there has been no other comments on problems with sides of flabby/Saturn mold origin panels