yesterday i diyed a durso standpipe and i cant seem to get it working properly. i have a 1" bulkhead and starting from teh bottom i have a 5" length of 1" pvc, 1" x 1 1/4" bushing, 1 1/4" T, 1" 90 off the side, 1 1/4" x 1/2" bushing, short piece of 1/2", 1/2" ball valve to adjust the air flow. no matter how i adjust the air flow the darn thing still gurgles like crazy. the water level in my overflow doesnt seem to wanna stay constant either, it keeps fluctuating up and down. what am i doing wrong????