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Tbh -1 to WS but gaining +1 to BS would be worth it, that is, if we can mitigate our Astartes loss in melee proficiency by amplifying their ranged deadliness. Plus we have a whole assortment of robots and servitors to back them up in melee if we develop a strong combined arms doctrine with our Mechanicum elements.
Remember too that aggression can be simulated.
We don't have to be as extreme as say, Angrons Nails, but there's a plethora of examples of neuro stimulators, chems, and other tools the Techpriests use to boost both the combat aggression of themselves and their servitors, which they also are easily able to turn off thanks to emotional suppressant and anasthetics.
One more thing: do you really need Melee if you are so gosh darn good at shooting someone point blank? Look to the example of our Steel Wardens - you don't need to stab someone in the face when you can shoot them in the face!