Support material first layer adhesion issues
Quick, low-tech solution:

There might be several issues in your question, but in relation to bed adhesion, I'll share one of the most useful tips I wish someone had told me when I started out: Spread some glue-stick over the area to be printed.

I used ordinary school/craft glue stick (which I stole from my daughter's school pencil case) - the kind for gluing paper. I use a purple one, so it's easy to see and easy to clean up. I apply a little glue then smear it around with a wet finger to make it a bit uniform.

I have a heated bed (FlashForge Creator Pro) and have used this little trick with a range of filaments. In almost every case, it helps adhesion enormously. Parts and supports stick like mad! But they still come off easily enough the usual way. It is a weak glue, so it won't lock the part to the bed. Once the part is off, the purple glue is visible when wet, so it is dead easy to clean up the part and the bed in a minute or two.

This trick is so easy that it is worth trying first for any adhesion issues, before digging deeper.