We use a simular environment: Dalet V2.0, Xtend 1018 and FCP 6.06, we gather on tape and P2. With this setup we don’t experience your audio crossing issue.
We have another issue with Xtend and P2: after importing multiple P2-clips from Dalet to FCP the longest durated clip is offline in FCP. Do you experience simular problems with Xtend and how do you import P2 into Dalet ???