2 pi holes with gravsync and dual DHCP servers - low % blocked?

Expected Behaviour:

Both piholes should be blocking same % of traffic

Actual Behaviour:

Primary pihole blocks 30% or so of traffic, secondary blocks less than 2%

Debug Token:

(not sure if this is strictly needed, but can provide if needed)

Additional Info

I've got 2 piholes running on my home network. Both run DHCP with different IP address ranges, I've got gravsync keeping their adlists up to date.

But one of them is blocking a much larger % of traffic than the other. To avoid using a DHCP fallback script I've made sure that while bothhave DHCP active, they assign different IP address ranges to their respective devices.

Wondering if there is something off here that I should be worried about?