Hi subaru3417,
Shouldn't change the swing weight very much.
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Also if I changed to the larger grip size is this likely to increase the potential for a slice or hook and/or reduce or increase distance?
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A larger grip will restrict the amount of wrist movement in the swing, so it 'generally' helps people who have an excessive right-to-left shape shot to straighten their ball flight. Of course it is more advisable to fix a fault such as this at its source rather than compensating for it

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PS: Larger grips are also generally a good idea for senior golfers who have arthritis as they limit the amount of wrist bend in the swing.
I would advise getting a jumbo grip fitted to one club to start with and see how it feels and how it affects your swing->ball flight. If you like it, have them all done if not, you have only lost one grip.
Hope this helps