Whats to keep that block from shifting forward? The lip may help with creating the batter and the alignment, but doesn't it also help keep the block from sliding forward?
I think your supplier Jim, was feeding you a load of crap. Their block busted apart and they know it.
In terms of curves, when you wack the lip off, you then use a little block glue to hold the block in place since the lip is gone.
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My Equipment Brag List:
-1 CAT hat
-16 pairs of Hanes socks (the Heavy Duty model), many with holes.
-12 pairs of underwear, ranging from Joe Boxers to Jockey, many are in need of replacement. (no more photo requests please)
-hundreds of t-shirts. Some w/ grease stains, some torn & tattered.
-7 pairs of jeans, ranging from Levis to Polo to GAP. 1/2 of them have holes in 'em.
-1 pair of old worn out Nike shoes.