273 rockers on e-heads

I've got a set of e-heads set up for hydraulic flat tappets and 273 rockers that are giving me fits. I started grinding on the rockers to get .clearance between them and the valve but have some that just won't give me the clearance I need. So I swapped that rocker for another one that clearanced fine, but I still don't have clearance on that problem valve and the rocker that had insufficient clearance to start with has plenty of clearance when installed on a different valve. So it seems like it's valve/retainer related.

This is those two valves - the one on the left has insufficient clearance, the other one is fine.
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I think I've ground them about as far as I'm going to, so I wondered what the chances are that valve will center up under the retainer with use, like the other one is?