[FCP-L] AE renders stutter in matching XDCAM project

I'm preparing After Effects Quicktimes for a FCP project with XDCAM
footage. Although my AE renders seem to match the footage in every
way (below as spelled out in the various bin columns) I'm
encountering a lot of stuttery playback on the AE renders (footage pb
ok) though they're playing off the same SATA drive as the XDCAM
footage. I'm a FCP newbie but baffled by this, any ideas?

both the footage & AE files present as 1080p24 35/Mb/s VBR 23.98
1920x1080 data rate 4.3

Thanks,

Paul

CP 6.0.6 Qt 7.6.4

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