1 year old Ball Python
Feeding in a separate container does not prevent cage aggression. That is a myth. Force handling will only stress the snake and make it more defensive.
It sounds like some part of your husbandry is off or that the snake is maybe in a good deal of pain. If he is eating properly and if defecating and urinating normally, I'm less inclined to believe a health issue is in play. Another piece of the puzzle is what caused you to get bit the first time? Did yo wash your hands after feeding? Did you make a sudden movement, etc.? When bit, did you jerk violently away? If you did, you could very well have injured a good many teeth or pulled them out entirely. This painful and can lead to infection in the mouth, which is both potentially fatal and painful.
Check your temps. You do have two thermometers, one on the cool end and one on the warm end, correct? Guessing isn't good enough. You need to know. Problems with conditions can make a Ball aggressive.
Also, since I see that you are feeding live, you need to look the snake over for bites from the mouse. These can become infected and cause lots of pain. You should only be feeding frozen / thawed to prevent feeding injuries and parasites.
After you have ruled out bite injuries, injuries to the mouth from you jerking away at getting bit and husbandry issues, I would collect a fecal sample and find a vet to check it for parasites and treat accordingly. Often, you can get a sample tested without bringing the animal in and incurring the cost of an office visit.
Best of luck with your snake.
Edit: Germ-X will not cause the aggression, nor the striking of the glass. As a matter of fact, the smell of Germ-X (which is mostly alcohol) will actually curb biting because the snake will move away from the alcohol smell. Coincidentally, alcohol (either drinking or rubbing) will get a snake to release if it has bit and latched on.