Hi, i don't know if you plan to continue work on this anytime soon but i noticed that healing ability doesn't seem to work, tried to check logs but they don't give any indication what would be wrong either.. Im suprised that nobody else has reported it before.. Using forge-10.13.4.1614 and the mods i use are following:

1.7.10_AM2-1.4.0.009.jar
AdvancedLightsabers-1.7.10-1.2.2.jar
AnimationAPI-1.7.10-1.2.4.jar
Aroma1997Core-1.7.10-1.0.2.16.jar
Aroma1997s-Dimensional-World-1.7.10-1.1.0.1.jar
Botania r1.8-249.jar
CodeChickenCore-1.7.10-1.0.7.47-universal.jar
CoFHCore-[1.7.10]3.1.4-329.jar
CosmeticArmorReworked-1.7.10-v6b.jar
DummyCore1.13.jar
EnderCore-1.7.10-0.2.0.39_beta.jar
EnderIO-1.7.10-2.3.0.429_beta.jar
extrautilities-1.2.12.jar
FastLeafDecay-1.7.10-1.4.jar
ForgottenRelics-1.7.3-[Final].jar
FTBLib-1.7.10-1.0.18.3.jar
FTBUtilities-1.7.10-1.0.18.3.jar
ImmersiveEngineering-0.7.7.jar
IronBackpacks-1.7.10-1.2.20.jar
ironchest-1.7.10-6.0.62.742-universal.jar
journeymap-1.7.10-5.1.4p2-unlimited.jar
Mantle-1.7.10-0.3.2b.jar
MouseTweaks-2.4.4-mc1.7.10.jar
NotEnoughItems-1.7.10-1.0.5.120-universal.jar
TConstruct-1.7.10-1.8.8.jar
Thaumcraft-1.7.10-4.2.3.5.jar
thaumcraftneiplugin-1.7.10-1.7a.jar
ThaumicBases-1.3.1710.4.jar
thaumichorizons-1.7.10-1.1.9.jar
ThaumicTinkerer-2.5-1.7.10-164.jar
ThermalDynamics-[1.7.10]1.2.1-172.jar
ThermalExpansion-[1.7.10]4.1.5-248.jar
ThermalFoundation-[1.7.10]1.2.6-118.jar
twilightforest-1.7.10-2.3.7.jar
Waila-1.5.10_1.7.10.jar
Wawla-1.0.5.120.jar
Waystones-mc1.7.10-1.0.12.jar
witchery-1.7.10-0.24.1.jar
[1.7.10]DamageIndicatorsMod-3.3.2.jar
Baubles-1.7.10-1.0.1.10.jar
CodeChickenLib-1.7.10-1.1.3.138-universal.jar

Here's small clip aswell of healing not doing anything even when i have loss of health https://streamable.com/qfpngi

Also other mention, if you throw lightsaber into nether portal, it's permanently gone, maybe make the lightsaber not actually vanish from the hand so it basically always returns after set amount of time if it happens to disappear. And also it would prevent you picking up other junk from ground on the slot where the lightsaber originally was at.

It looks like you have the regeneration effect on in the clip, which isn't doing anything either. This indicates to me that there's some other mod you're using that is intentionally disabling all types of health regen.

Ah, it's special type of regen from a mod i found out that was bit buggy called thaumic horizons, the regen from of the vat infusion doesn't seem to function properly sometimes, i don't know if that is the cause though, i'll try without the mod at somepoint when i make new world again