you need lots more timing at idle.
only 11 inhg of vacuum at idle is a problem with a cam that small. should be getting about 17 at 800 rpms.
low timing and improper fuel ratio will reduce vacuum.
I would run 15 initial, with 10 more from the vacuum advance on a manifold source (25 degrees at idle with advance).
then 35 to 36 total mechanical plus 10 from the vacuum advance (46 total).
your distributor should be full adjustable.