PVA Support Adhesion

I’m printing a fairly large object, a bust/head for a doll, on a Taz6 with a dual extruder head.

The bust is roughly 170x170x240mm tall. Laying on its side, it covers most of the bed. But because the bust has no base, is hollow, and is extremely irregular, most of the early layers are almost entirely PVA with just a few small points where the PLA part is touching the bed.

I’m attempting to use PLA/PVA. I’m having severe problems with the PVA not sticking to the bed and curling up in all directions.

Any suggestions on how I can prevent this would be tremendously appreciated.