This has the same problem as your Tech X unnerf but in this case it's even worse it dosn't unnerf/affect things at all when they are buffed by items like chemical peel.
Without your mod (all with isaacs base damge=3.5)
Normal Tech 0 Arc: 1.1 Damage (isaacs damage * 0.3)
With Chemical Peel: 1.7 Damage (chemical peel tear damage * 0.3 would do (isaacs damage + 2)*0.3
With Tough Love and debug 9 to get enough luck that every tear is a tough love tear: 3.4 damage (Isaacs Damage * 3.2 * 0.3)
With Your Mod:
Normal Tech 0 Arc: 3.5 damage
Chemical Peel: Sometimes 1.7 Damage, Sometimes 3.5 Damage (probably some weird logic as to what tear is used to calculate tech zero damage)
Tough Love + debug 9: 3.4 Damage
What it should do:
Normal tech 0 Arc: 3.5 damage
Chemical Peel: 5.5 damage
Tough Love: 11.2 damage

So not only does you mod not accout for items like chemical peel or tough loves it completly stops working when tears do more then isaacs base damge. This is probably easier to fix then with Tech X just multiply tech zero damage by 3.33 / divide it by 0.3 (and yes it's 0.3x what it was before not 1/3 otherwise Tough Love damage without the mod would be 3.7 not 3.4) and remove the check that stops it from working if tech zeros damage is larger then 0.33*isaacs damaage (and damage <= technologyZeroDamage)