As mentioned by the previous reply....you 'can' enlarge the holes a bit which will help IF that's the problem.
You might also remove the cover and make sure it's straight to start with. If it is I'd take my trusty edge rolling tool and roll the edge. This will 'lift' the portion that already snug and will help the sloppy part to lay down. It will also stiffen the edge.
The fact that this concerns you tells me your doing a good job

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