You can usually tell by the noise it makes if it is going to work good enough or not in the first 2-3 seconds, well before sealing. If it sounds bad stop, and start over. I went through the same issue a couple of weeks ago and wasted about 10 bags before I figured this out.
Homemade Wood Smokehouse, Charmglow gasser, Smoke Hollow, UDS, dual chamber homemade grill, Uline Weber Kettle
Certified MOINK Baller
UNLINED DRUM KING OF CHICAGO AREA
Scrap Iron Chef