So I have been using Nutri-Lock rolls and have went through a few 100 feet of the stuff. Last week I opened a new 2 roll package of the 8" stuff and couldn't get a good vacuum on pork belly bacon pieces. Well I thought it was the Foodsaver unit itself but today I was vacuuming some Costco meat and found that my vac sealer doesn't seem to have a problem vacuuming Foodsaver quart bags but won't pull a vacuum on the Nutri-Lock bags. So now I'm wondering if it's the bag material or if my vac sealer is just getting weak? The sealer seems to be pulling a good seal with the Foodsaver bags but it might not be as strong as it once was? So what do you guys think?