Hi and welcome to CoffeeSnobs! :)
Im a lot newer at this than you, but you wont ever need a froth enhancer if youve used commercial machines - youll just find your 800 steam wand less powerful and therefore slower than youd expect. You may need to use smaller jugs than youre used to as well. If youre used to using two-hole wands, the single hole needs a slightly different technique but youll master that quickly by surfing the top of the milk and keeping the wand near the side of the jug to assist the whirlpool to commence.
What brand/model is your burr grinder?
Ill leave the other questions for people who own a modified 800 (I owned a Breville Cafe Roma until recently). What size is the basket?