sounds like your bed levelling is the issue.

You need the nozzle nearer to the bed. You don't need much smoosh - but you do need a little,

NO do not sand it !
Just adjust your printing height for the first layer.

Hang on if it's balling up in the nozzle - then you might need to move the nozzle sightly further away from the bed.
I tend to go in increments of 5 100ths of a mm. so 0.05 at a time either up or down.

Also can't hurt to give it a wipe with some acetone, might have grease on it.

Just hope they haven't changed the formula for this new, thinner stuff and bollixed it up.