Your description of the fight scene kinda matches how i was thinking it would work in the last line of my previous post, so i think that might be along the right lines to get what your going for (obviously it will need to be seen and some adjustments might need to be made)
cauterized, im not sure what pile of blood (though blood normally pools

Lucas had the opportunity to show us these extremely powerful jedi of old, except he shows us a Jedi master that at 50ish years younger has more trouble lifting a small crane as compared to an x-wing (remember size matters not, so it shouldnt matter either way the size, they should be equally as easy). Plus, i dont even think age matters (i think chaltab mentioned palpatines age vs dooku's in relation to the ease of the force lightning) Wouldnt it be more of a mental strength and a connection with the force that allows you to do force related things easier, not the fact that your physically 50 years younger...if that was the case maybe those kids should have been teaching yoda

With the mention of dooku's ease of using the force lighning compared to palpatine, plus the fact that it ruins the impact for when palpatine uses it in jedi, i say get rid of it, yodas deflection of it isnt worth it, keep us imagining how powerful yoda is, it gives a better impact than you could ever get showing it on screen (also, as an explanation, palpatine might have been putting more energy forth cause his lightning was a lot more powerful than dooku's)
-Darth Simon