The colour head just has a switch - set it to 66box (rather than 35 box), and all is fine.

I've always used the glass carriers that came with the Durst. Dust is a PAIN, but it's not as bad on the diffuser as the condenser. The only time I've had real problems with glass is with 110 negs - for some reason they curl more or something, and I got really bad newton rings, when using exactly the same carrier as I use for larger formats. I ended up making my own glassless carrier for 110.