"Stop me if youv'e heard this one before"...
I came across this 3M product at Lowe's recently. I gave it a shot and boy do they work great!
The blocks come in angled edges and "block" edges. They also have foam sheets.
So far their finest grit seems to work just fine for rough work such as spines, intakes and wing edges.
If this is something already posted, I apologize. No, on second thought I don't - just deal with it