That’s a pretty comprehensive list!
By flour like taste, are you also referring to the texture? I suspect it may be a combination you’re referring to. Huel sure does have a bit of a ‘sawdust’ feel to it. If you eat dry oats, it’s a similar effect. Somewhat floury with powder and dry in the mouth. I actually got used to that pretty quickly and don’t mind it at all now, but obviously that doesn’t help if you haven’t.
There’s two things which have helped, for me, and neither is ideal. One is cooking it, making Huel pancakes. That’s not great as it can impact the nutritional value.
The second is chugging it, drinking very fast - down in a minute or two. It doesn’t change the texture but it gets it over quicker!
Sorry I can’t be more help, but thanks for the topic - I hope someone else has some good advice as I’d be interested too.