Is a 10:1 damage scale between mechs and humans balanced in my RPG?

This seems obvious, but there are other scaling factors I could consider: 2, 5, and 10 seem likely and doable.

So with a scale factor of 10, that means if a Mech deals 1 damage to a human, the human actually loses 10 HP. Meanwhile, if a human deals 10 damage or part of 10 damage to a Mech, the Mech only loses 1 HP. Average human level 1 character has 3 Vitality for a total of 35HP, so if they get hit by a Mech scale weapon, they are pretty much dead in one hit, which is as it should be.

Would a scale factor of 10 be fine, or are there other considerations which might make 2, 5, or even 20 work better? What do you think?

My game is borrowing from Final Fantasy and Mech Warrior, without being a direct rip-off of either series.

Is a 10:1 damage scale between mechs and humans balanced in my RPG?
Post Opinion