I brew it every year. Modifications I have made -
I have added a half pound flaked oats to it - I like more body, smoothness, etc. It was good, but probably not necessary.
The one change that I have made that I have used the last 2 times is that I added 4 pounds of weyerman smoked malt to the recipe’s grain bill (did not eliminate anything, just added the smoked malt.) I like that addition and will probably continue to use it.
I used heavy toast cubes in my last batch instead of medium - have not tried it yet - other than at bottling. It was great then.
That is really all I have tried differently with it - it is a great recipe to start with. I brewed it 2-3 times exactly as is and those batches were great.