Hello,
the right setting depends mostly on how much do you need, maybe the 85MB are enough, maybe not. dbcc memusage shows more details of your proc cache, also you may use
sp_monitorconfig 'procedure cache size'
to see the max value of proc cache used since last reboot
I would propose to set a bigger value (200MB maybe) and from this starting point decide to increase or decrease it, the 85MB seem not enough to me, however the most important factor here is how much proc cache is required by your workload.
Regards,
Kimon