We need to back up. OP claims that Axis artillery (actually, Panzerwerfer and Walking Stuka, not off-map artillery abilities in general) inflict more TK damage than their Allied counterparts.
But is this even true? Because if not, we're voting on an issue that may not even be an issue at all.
It is. I've done the research a few times.
All allied artillery deals a fraction of the damage as friendly fire compared to the friendly fire values of axis artillery.
Grenades are an exception, which deal 50% friendly fire for everyone.
The Land Mattress was a unique one that dealt an apparently arbitrary amount of friendly fire in between(ish) the general values for allies and axis.
Pretty much if you are allies you can tank artillery barrage after artillery barrage with your units, so there's never a reason to dodge them. Rather it's an incentive to assault into a barrage instead of after it.