They have announced the CCR-1072-8S+
72 cores, 8 10G ports, 1 1G port, redundant PSU.
Should be nice, and close to what you are looking for.
Hopefully they will be out sometime this year.
v5.3 should fix some slowness you might have had in v5.2
no need to downgrade, just wait until we release the update
i haven't seen this problem on 5.3 so far.