yes whole hops mess it up unless you have a screen or a hopblocker. I did yoopers pale ale with some home grown hops that were growing with my grapes and one cone plugged the valve. I might of been able to rack it with out problem, but my auto syphon took a dump on my and will not prime. I really need a do up a keggle and a pump to do this right.
How long do you let your zero minute hop additions steep before cooling?