For p_SortD, affecting de doesn't matter because if you follow the code path, the next occurrence of de is when it is loaded from hl, so its contents don't matter.
As for p_Mod, ac is the division result, which is never needed. You can also notice that in the original routine, the new bits shifted into ac are never read.
Edit: fixed grammar
Also, some peephole ops I would find useful.
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| .db 3
sbc hl,de
ld a,h
or l
.db 2
sbc hl,de
|
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| .db 8
ld de,$0000
add hl,de
sbc hl,hl
inc hl
dec hl
.db 6
ld de,$0000
add hl,de
sbc hl,hl
|
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