How do I combine multiple common-collector stages without circuit loading or distortion?
This is a faulty design.

There is no voltage gain, only unipolar current gain and passive pull down
There is no negative feedback
The load is AC coupled lower R than final stage emitter R so it becomes emitter current starved and cannot pull down enough current to AC load of 8 ohms
The DC offset is 5x -0.65V

Bad design since no design specs and bad methodology for a power amp.