The important thing with epilepsy is to get a clean and truly balanced diet, anything in a food that shouldn't be there, especially artificial colourings and additives, can cause imbalance in the body. higher carbs can also cause imbalance as the body tries to adjust to deal with it. Higher protein and fat foods are usualy lower carb.
High quality animal protein will not cause lesions, lower quality plant based proteins shouldn't do either, but look out for the E-numbers etc. also note that protein % or fat% is only a part of the equation, you need to also look at the daily feed amount. It is possible that with lower feeding amounts you will be feeding less total grammes of protein/fat than a food that seems to be lower based on % alone.
I can only comment on Eden, and experiences with a number of our customers with epileptic dogs and all have reported incidence of fits reducing from every few weeks to several months apart or in many cases no more fits at all (so far). I do remember we removed one of the herbs as it was mentioned that it could be a potential trigger for fits, apologies as I can't remember which one it was, I will try and find out, Feel free to join us on facebook and speak to other customers yourself, I would advise this with which ever food you choose.
There are, of course, other foods will be suitable (and I certainly wouldn't rule out a properly balanced raw diet) I just don't have any experience of them to be able to comment.