You don't play Flannery, play 2nt as natural and GF (major suit raises are handled differently) and try to avoid bidding 2 of a minor just to create a GF. The choices appear to be are 1♠ on a bad suit when you such great support for partner or 2♣ to create a GF (anyone for 2nt ?). Say you try 1♠, partner bids 2nt, 18-19 balanced or may be an upgraded 17 with a six-bagger. Now you can bid 3♦ check-back to inquire if partner has 3♠s or bid 3♥ forcing. You seem to have close to slam values. How do you move forward without going overboard ? In minor suit auctions with near-slam values, we can often explore slam on such hands as 4nt can be passed, but unfortunately if you support ♥s here, 4nt by either of us is RKC.
If you try 3♦ and partner bids 3nt denying 3♠s, he might easily be 2533, in which case you have to worry about length tricks outside ♥s. Although undiscussed, 3♥ should deliver an extra ♥, in which case 6♥ or 6nt should be favorite. Even with a 3♠ response, you have one additional suit that has potential for an additional trick. But what do you do over 3nt ?

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