Sorry, idiot me copy paste the sample lines I found here for dnsmasq.conf.add instead of the ones I'm using:
interface=wl0.1
dhcp-range=wl0.1,192.168.2.100,192.168.2.125,255.255.255.0,86400s
dhcp-option=wl0.1,3,192.168.2.1
dhcp-option=wl0.1,6,192.168.2.1,0.0.0.0
Very similar to the ones...