Upon further thrashing around I tried
and discovered additional arguments for ifplugd.
In /etc/ifplugd/ifplugd.conf there is a section for "Additional parameters"
# Additional parameters for ifplugd.
# (Run "ifplugd -h" for further information.)
#ARGS="-fwI -u0 -d5 -pql"
ARGS="-fwI -t2 -u0 -d10"
With a little reading and some trial and error I discovered that the second set of ARGS should be uncommented as above. It appears that in my thrashing around, before I fixed the underlying problem (I had to re-install ndiswrapper), I commented out the required ARGS.
Thats right I did it to myself.