The site kindly provides a forum for the discussion of MANY ideas . . . not all mutually inclusive. IMHO, we all have different backgrounds - genetic, medical, lifestyle - and need to discover what is good for us. If veganism is working for you . . . maybe that is the way to go for you . . . for now, at least.

Unlike land-based meats, seafoods go through a process called "auto-lysing" which mean they dissolve back into seawater. They don't cause the colon plaque that land-based meat does.
I have to say I strive to be a raw-foodist vegan, but I've come to accept eating a little sashimi now and then for the fats/minerals. I do high-rise construction and winterime is just too cold otherwise. Also since I don't live full-time out of my garden anymore I noticed that I started feeling 'out-of-whack' by being dependent on store-bought groceries, and not having the access to sanitary weeds and wild-foods.
Like you initially I was turned off about the B-diet due to all the meat, but as I am a non-secretor there is a lot better diet for me.

Find your secretor status and look into LR4YT.

You can never go wrong eating veggies and fruits. Its very important for A blood types to be vegan....and I think that's where all the buzz about just-for-health vegans comes from. but for ethical reasons i don't eat animals, veggies are better.