Those six capscrews all come with factory applied "locktite" and can be difficult to get out. Certainly flush out the central cavities before trying to remove them, use a new tool...but..you still may have trouble getting the ratchet into a good enough position to get enough leverage applied to get them moving w/o stripping out the shoulders in the cavity. I have had good success with an impact hammer on these fasteners. Have never had one strip out. It may seem to be a rather unelegant way to do it, but it's quick and it works.

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Jeff Lawrence
1989 300e
2000 Dodge Grand Caravan SE
No matter what you fix, there will always be something else to fix..
"Warranty" is just another way of postponing the inevitable.