I have a 15' Sotar Legend w 24" tubes which works fine w oarsman and one passenger plus some group gear. I'm 195, she's around 125. We carry a Yeti cooler plus full dry box, kitchen, water jugs, handwash, dish buckets, gear bags, tents, etc.
If I were to do it again I might get oversized 25" tubes but would not go any shorter in length. Might even consider 15'6" or 16' tubes. You really don't notice a one ft length diff when on the water. My guess is 14' tubes is pushing it.