Emilios,
This guy knows of the problem, I reckon he will fix it and fix it well.
Remember, it is quite probable that your maggie has had this split the whole time you've had the maggie/bike.
Whilst 20 degree is extreme in my opinion, I bet any unmolested maggies have more that a couple of degrees split.
By all means fix it, make it more accurate, but I feel it really is not that big a deal, if you want to make your timing super accurate, convert your bike to 12 volt and go electronic, the problem will be well and truely solved that way.
But your bike will always be a 20 odd HP, awesome looking peice of motorcycling history that can pull tattooed biker chicks at the pub, and thats what really matters
.