Any non-dairy milk will not have the same mouthfeel as dairy milk. All the non-dairy milks I've tried are more watery and definitely have less fat which could be the issue you are experiencing. Typically those "milks" have a lot less fat and are less creamy than dairy milk. It's essentially water extracted from the plants/beans/whatever and sold to the consumer. The only milk I can stand is sweetened low fat soy milk. I've tried coconut milk, almond milk and years ago a non-dairy creamer and they all were so gross to me. The non-dairy creamer had the mouth-feel of milk but its taste was horrible.
As a kid I would get moody and irritable and downright mean when I would ingest milk so mom had to take me off of it, substituted the non-dairy creamer. I hated it and eventually quit eating cereal.
Now that I'm experiencing atypical and some typical signs of celiac disease I am exploring all my options and have found that IF I do develop an intolerance to milk/dairy I would switch to soy milk products. Dad already buys soy milk because of his lactose intolerance. But I rarely eat cereal, mainly due to my diabetes (spikes in blood sugar) so that limits my milk intake anyway. I don't anymore just go and drink a glass of milk. I used to last year. But last year my hunger hit an alltime high even if I had eaten a large meal, an hour later I'd be starving again. Needless to say I have gained over 100 pounds in just a few short years (poss. sign of celiac disease) and developed neuropathy which we originally thought was from my diabetes. Now I question that association.
Sorry for the long post. I guess I didn't really need to mention all that. But yeah any non-dairy milk is not going to feel the same in the mouth as dairy milk.
Oh and I know that Crest Pro Health toothpaste causes burning in the gums and cheeks for me, and it makes my gums and cheeks peel, the skin dies and gets replaced fast since the mouth always heals very fast. So I peel off skin from my cheeks because I can feel it and it's gross!! Needless to say I don't ever use Crest Pro Health anymore. I use Colgate Pro Enamel. It doesn't cause that reaction to me. Maybe you are having the same issue?