One of the most difficult parts of cooking on a cruising boat is that so called "marine" stoves and grills are, at best, pretty awful (I won't go into the part about them being way too expensive).
Right now we have an OK grill/BBQ. It gets hot enough to cook stuff but not quite as hot as I'd like and it really does not throttle down to where I'd like it to either. That said, it is OK considering every other propane BBQ we have had has been lots worse.
I have been considering swapping out the anemic burner for some time but it is nice to see that others with the same problem have already sorted out the problem and come up with a workable and affordable solution...
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