The 2020 NSP Ninja (14'0x22) has an advertised volume of 250.6 Liters. I see that all the online volume calculators tell me that I should be fine but I'm wondering from experienced paddlers...will this volume (~ 250L) to weight (85kg/187lbs.) work out for me? My weight fluctuates 5kg (80-85) depending on the season, so I'm currently at my max weight.
Yeah, the volume will be the least of your worries. 22" is scary narrow to me.
I have a 14' board that is 26" wide. Given that you are higher off the water on a thick race board it is already a bit tippy, but the width bothers me. Any side-on chop makes me wobble. It is fast, but the lack of stability means that I have not used it in a few years.
So, unless you are 4' tall, or have super balance, 22" will be too narrow.