12 inch piece of all thread is your problem. Look at it this way... If you pulled the oil pan to access the tube from underneath, would you create a way to push the tube out or use a drift and hammer to drive it out ? Push/pull aint the method. Knock it in, knock it out. Slide hammer knocks in reverse. I use a piece of 5/16 all thread about 3 feet long. I have a 10 inch piece of 3/4 inch schd' 80 black pipe I drop on the all thread because its heavy, then a heavy flat washer and a nut.This creates a slide hammer. If I was a body man I might have a actual slide hammer to use.
Back in the 80s Fords V8s had the dip stick tube at rear and no tether or bracket. To stand by the fender and pull the dip stick out was the proper way. To stand at the front of a Town Car ( about a half mile away it seemed ) reach and pull the dipstick from this angle would break the tube all too often.
I don't know how many times my homemade slide hammer has saved the day at several shops and for many fellow workers, for many years.