Scoring: IMP
In a sectional Swiss Teams this afternoon, I picked up this hand at equal nonvul. My partner and I play 10 HCP openings (along with a 10-12 1NT opening) when nonvul, so I opened 1♠. The auction continued:
1♠ - (x) - 2NT* - 3♥
P - (P) - 4♣ - (P)
4♠ - (P) - 5♥ - (P)
?
Partner's 2NT showed a limit raise or better in support of spades. 4♣ was a slam try of some sort (that much I knew - but we were treading in uncharted waters at this point). Clearly 5♥ was another slam try, apparently looking for second round control in diamonds. I have second round control of diamonds.
Should I bid 6♠?

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