I've been smokin w/ my GOSM 3405BGW for about a year now w/ mostly great results thanks to help from y'all...But one thing is driving me nuts! I always start out w/ nice TBS for about 15 to 20 minutes, then the chunks/chips (tried both many times) catch fire. I can tell as soon as I see the billowing white smoke coming out. Long ago I gave up on the crummy smoke box that came with the unit & have tried the medium sized (46oz) coffee can (laying on its side since there is probably 5" or less clearance under the H2O pan. Even on a low setting I get this same result. Any suggestions?