You have 3 very strong balls. Unless one of the them has a LOT of polish or you have very high ball speed, you need at least one light to medium-light oil ball for singles and doubles. Preferably, two. As someone who has bowled the last few Nationals, and since you have already decided to take 4 strike balls, I'd recommend 2 strong and 2 light to medium oil balls.
Having had both the NS and the Cell, polishing both or putting a 4000 Abralon finish of the Cell can allow them both to handle medium oil. I'd suggest doing that to one of them. And finding a resin pearl for medium-light oil.
In singles and doubles, you can encounter anything from a 1-2 board move inside from the team shot to completely burnt up shot requiring a move to the 4th or 5th arrow with a very mild ball. Likely, the Sgl/Dbls shot will be some between these extremes.
Good luck.
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"None are so blind as those who will not see."