Adelbert https://forum.atlas-games.com/t/animated-corpse-stats-for-moderation/347/1 (fifth post on that page has the relevant enchanted devices and the sixth post contains the relevant spells) used intellego spells to determine where his crossbow was aiming, how the wind would change the path of his missiles and where his targets were planning on moving. The last trick, reading your opponent's mind to understand their movements, seems like it should justify penalties to their parry totals and bonuses to yours. That's not exactly the same as boosting your attack /defense but it is in many ways equivalent.
Hugh of Flambeau from Magi of Hermes focused on spells and devices to aid in victory in combat to the exclusion of other pursuits. One spell -The Blessing of Stakad- grows an extra par of arms for the caster to use allowing him or her an extra attack in combat or an extra attack for his or her group.
I think that you could create some mentem spells to allow folks to function as a trained group and trained group bonuses add directly to attack or parry.
There are creo corpus spells to increase your dex and qik, but they're absurdly high level. You could alternately develop some MuCo spells to do a similar thing at, I believe, a lower level but you'll have to debate the specifics with your troupe.