The Merlin II does feel a bit twitchy when sitting if the seat is set high enough to allow heel clearance when kneeling. Mine feels that way to me and I suspect your feet are bigger than mine.
It sounds as if you want a canoe with pretty good efficiency that you can both sit and kneel in. If you were only going to sit, you might go with a Magic (if you came across one) but that strikes me as a boat that was intended to be paddled sitting.
The Wenonah Prism would no doubt feel more stable and is pretty efficient, but it too is usually paddled sit and switch, although I knew at least one fellow who paddles one kneeling. It is a rather larger boat though, a full foot and a half longer.
You might consider the Swift Osprey. That canoe feels a bit more stable to me when sitting than does the Merlin II and it is pretty efficient to paddle.
Kayak Motor Kit
First Need Purifier
Full Size Sail Rig
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