I think THP trifecta is to go big always
Bigger pot = bigger plant = more fruit
As Mezo points out.. transfer doesn't have to be a traumatic process.. in fact when done right it is very beneficial to the plant because it gives it room to grow.
In the future, I wouldn't wait until they are actually producing pods, but with several months left in your growing season... I'd say it is worth the effort.
With one exception to Mezo's fine picture, I'd emphasize that pulling the root bail out intact is one of the more important parts. If you can't release it intact from the pot, just go ahead and sacrifice your pot (cut the plastic with some pruning shears, smash the ceramic with a hammer, etc.) You can mechanically damage either the above ground part or the under ground part if you are not careful.
Don't do that.. just cut the pot away without disturbing the root bail and place it in its new home, and you will have a much better, successful, highly producing plant in the long run.