CCX sealed bearing question

On my CCX bike I'm replacing my external bottom bracket sealed bearings (which are full of mud) and my Easton XD90 wheel sealed bearings (I've not seen what condition they're in).
My question is this, given the slop we all race in do you recommend adding additional grease to the manufacturer's grease for sealed bearings or do you just install with the original lube?
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ThanksEd Lanton