I've played a few gigs with just this one mod and the amp sounds better all around.
No flabby bass.  The OD is still a bit hard or stiff as it always was at gig volumes, but its not bad and certainly no worse than before the mod.

Played the last gig with Deep Off the whole time - never felt the need to switch it on.

I'd like to try some of the other mods - like the slope resistor.  Hywelg gave me some info on what parts to get, but when I went to Mouser to find it - there was a bewildering array of similar parts, so i had no clue what to order.

Does anyone here have any extra parts they'd like to sell?  That way I could be sure I'm getting the right items.

As regards parts for the various locations, the best bet is over at the Ampgarage. There are a number of BOM's in the files section that have Mouser part numbers and/or links directly to those parts. Best plan is always to get more than one of each item (resistors caps etc) and one value either siden to build up a stock of alternatives.

Very good idea to print out the layout and mark up any mods you do, and date them. I didn't do that from the outset and I wish I had.