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My husband is 6'1" and was fine in the regular Explorer, and it his Romany I sometimes borrow. His first full length kayak was an Aquanaut rather than an Explorer because he found the Explorer to be a bit too supportive - otherwise known as boring. He was running up to 185 pounds, another 15 would not make a difference. The Romany can be more uncomfortable than the Explorer for people with thicker thighs though.
We have a friend who is 6'4" and weighs more than 200, and after much looking a few coaches have admitted that his Explorer HV is probably too small for him.
BIG note re the various versions of the Explorer (and the Romany) - all of them are for the same volume paddler regardless of the name. The hulls are the same for the LV, regular and HV versions, all they did was alter the deck height and mess with the cockpit. The LV and HV are more about paddler fit in the cockpit than anything to do with the volume. (This created an issue for small paddlers that they fixed with the Pilgrim boats.)
The one that may be different is the HV version of the Romany - that might have come off the Romany S(urf) hull rather than the regular one, and that hull was tweaked.
FrankNC: good list. But why would you categorize the Easky 15 as a "rec boat"? It's a light touring boat. I think you may be confusing it with the Easky 13 model, which is on the cusp of rec and light touring. At 15' and 22" wide with a standard cockpit, I would not call my 15LV a "rec boat". It has virtually the same dimensions as my Feathercraft Wisper including a low stern deck and it can be edged and rolled, which are not talents one associates with rec boats.