Received set of replacement seals from gamo 2 weeks (@$@#$%##!!!) after placing the order. Popped one in this morning. Works perfect! No more vertical strings. I took the long way to solve this easy problem, but at least I got a tune out of it...
Side note: I performed wax paper test NUMEROUS times and it always had a nice round hole with no rips, I guess it's not always 100% accurate.
Thanks to everyone, who chimed in!
Chris