Heat Lance if you dont need dedicated AT. HL's will need 5+ most times against vehicles so will HWB, but you will always do a mortal wound with HWB on a 4+ even if you dont wound on that 4, its still a mortal wound. With that said, DL's are more of a better AT now than a few Haywire shots (Imo at least, i need to do the hard math).
I personally like them with HL's.
Mandrakes are good at Mortal Wounds too, having 1 unit is a good idea (if you have the points), minus to hit against them and a 5++ with a 6+++ is nice.
About being more of a null deploy army? sure we can, but we are so much more survivable and faster there really isnt a need too currently (until the meta figures everything out.)
New to Blogging, just starting https://maddpaint.blogspot.com/
AoS: BoC 9k, CoS 3k