Dark Lance: Range 36” Strength 8 AP 2 Heavy 1, Lance (good ol’ standard Dark Lance)
Splinter Cannon: Range 24” Strength 5 AP 5 Assault 4 (makes it a very powerful, assault weapon for the DE)
Shredder: Range 18” Strength 6 AP – Assault 1, Large Blast (gives DE an infantry blast weapon, unlike the old one, it uses the large blast template – if I remember correctly)
Blaster: Range 12” Strength 8 AP 1 Assault 1, Lance (makes it have a slightly different purpose than Dark Lance)
These could be costed at 10 or 15 points each, and would not be OP since the price of your warriors went up.
I know this was a lot, but again, I really like the direction you’ve gone in. Hope my thoughts were helpful.