As a learning experience for anyone else that's just starting to play with a karni for real, if you hear that loud "POP" it just means its not running at a pressure that it likes. After getting impatient waiting for help, I decided to do what all cocker owners should love, tinker. Tweaked the reg on it and now shoots ropes, straighter, further and more consistent and no more pop noise.
There are probably many other guides on this but in 2 hours of looking around I didn't find a very clear one.
Instructions for sweet spotting without a gauge on the reg (stock reg) and without a chrono:
BE WARNED: GO TO A FIELD AFTER AND CHRONO TO MAKE SURE YOU ARE WITHIN RANGE AND ADJUST ACCORDINGLY!
1. zero out reg (unscrew completely)
2. turn in one or two full turns (should now roll ball our of barrel or shoot 5 feet)
3. turn in 1/8-1/4 turn at a time until achieved desired distance, speed, and sound.
4. if you cannot get it to desired speed and it begins to drop off again, find max speed by repeating above, and tune via IVG (using karni tool, maybe I will post some instruction on that once I find my tool but until then, its basically the same as any other cocker just with a tool instead of taking off the rod and using a hex.)
Hope this helps anyone else with issues.