Doors are the most difficult to get done right imho. They always take some finesse. Tricks ive found- Bevel the door jamb so the type K fits snug. Staple the rubber to the jamb before installing the jamb. To get the rubber stapled straight, dry fit it in, while laying in the floor and table. Use another 1x board resting up against the rubber. This sandwiches the rubber in straight. Then you dont have to stretch it or warp it. Use screws to install the jambs, this way you can partiallly screw them in, as your making adjustments and checking the door close for smoothness and seal. Use a wide cabinet clamp to bend the jamb if needed. For instance the middle of the jamb isnt sealing up right. Leave top and bottom screwed in half way, then use the clamp to bend the middle, screw in the middle. You may have to rip some width off the jambs so they are all even.. Use a flashlight and have someone run it around the seal, while checking it in the dark from the other side. Or leave the lights one side of the door, check the other side in the dark. I also found it helpful to leave the door frame board with extra slack, then mount the hinges on door and frame, make sure it fits, then cut the frame board to size. This alleviates the need to measure the hinges super accurate relative to the top and bottom. Best of luck.