Help with Flashforge Creator Pro

[curious aardvark]

why are you using a raft ?
Completely unnecessary - don't think I've ever used on one the knp (replicator pro clone) , also the pva won't stick well to pla - one reason it's good for supports. You don't actually want supports to stick to prints.

That right there could be your problem.
If your settings are good and your print surface is good - then rafts are pretty much never needed.

rafts are usually used when there is poor bed adhesion or the bed is not properly flat. There isn't really any other use for them.

up the first layer to 150% and slow it right down to around 10mm/s. It might be necessary to adjust the z gap as well by a tiny amount for a little squish.

one issue is that pva tends to work best at 50-65c print bed and - as I understand it - pva wants nearer 100c.

One thing you can do is to make a solution of pva and warm water and use that as a print surface.

Just dissilve pva in as little hot water as you can get away with. Then heat the print bed to about 60c - and wipe it with the pva solution.
let it dry (fairly quick) then repeat 2-3 times.
Use the printbed at say 70c.
Both the pla and pva should stick really well to that and no need for rafts.