I always find that impact works better than pure pull (or push).
A simple puller with a bolt that you can hit with an appropriate amount of hammer is my answer.
This is my hydraulic press.
It looks like a wood splitter (it will do that also!!), but, its main intent was a hydraulic press that I can hit the end of with a sledge hammer.
That is a piece of 1/2" wall tube where the splitting wedge can also be inserted.
Get a bigger hammer!!
A simple puller with a bolt that you can hit with an appropriate amount of hammer is my answer.
This is my hydraulic press.

It looks like a wood splitter (it will do that also!!), but, its main intent was a hydraulic press that I can hit the end of with a sledge hammer.
That is a piece of 1/2" wall tube where the splitting wedge can also be inserted.
Get a bigger hammer!!