At least for me:
1- FTTH 1MB
2- ADSL 20Mb
Internet connection on proxy clients stopped, the latency was too high (200ms) and speed was low (20Mb working at 4Mb). With chris4916 help i set the rules like this:
SMTP - FTTH
POP - FTTH
DNS - FTTH
HTTP - ADSL
HTTPS - ADSL
Other stuff - ADSL
And REMOVED "Any TCP" and "Any UDP" from rules. Then i got 9, 10 ms on latency (ping) and got speed back.