First layer issues after Ratrig Toolhead upgrade

So, I splurged and bought a new Ratrig Toolhead with all the bits & bobs. Rapido UHF, Orbiter 2, even got myself a beacon. Everything installed and homed in - and that is when the trouble starts.

For the love of me I cannot get a decent first layer. The blob-tower nozzle wipe works fine, but already when printing the edge of a first layer it goes to pieces. The rim looks under extruded, and the nozzle starts to roll up the PLA. I'm lost - any advice would be greatly appreciated.
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