You may want to consider using a large carbon filter inside your tent as a scrubber to just clean the smell before it has a chance to leave the tent.. The bigger and higher the cfm the better in this case.. just get the biggest one you can fit and or afford.. lol.. also, Ive heard carbon filters work best if you draw air in through the filter(Filter->fan).. rather than pushing it out (Fan->Filter).. So putting your existing filter inside the tent with your exhaust drawing through it from the inside may be a good idea.. From the sounds of it though.. you may just need a bigger filter! Also.. check and see if yours is an "activated" carbon filter.. as I believe those need to be moistened with water from time to time in order to work properly.. Cheers!