The 75 is listed at 4.2lbs. Not sure if that weight includes the crappy Innorel ball that’s shown with it. Assuming it is, the 80 listed at 3.4lbs plus a 14oz Anvil =68.4oz compared to 67.2oz for the 75. I kinda doubt the listed weight on the 75 even includes the bullhead anyway.its too big and heavy. that is weight with no adapter/ball head and it takes up more space than something like the 75.
Would you notice the extra 1.2oz?
Center columns are known to be the bane of existence regarding anything known as “stability”