I dunno what's going, I can't figure it out.
Things I've tried so far, using 901.xml for testing:
1000.15
1000.04
Drops only antitoxin
1000.00
1000.00
Drops only antitoxin
100.00
100.00
Drops only antitoxin
1000.99
1000.99
Drops only antitoxin
0.99
0.99
Drops all items including u-iso
1.99
1.99
Drops all items except u-iso
2.99
2.99
Drops all items except u-iso
0.15
0.04
Drops all items including u-iso, but with lower dropchance (items don't drop on every hit, only 20% of the time or so)
I then tried replacing the 901.xml "" strings with the ones from 1029.xml (previous SO) and going through the above numbers again but that didn't seem to have any effect.
So from what I can gather, the numbers in "" determine what drops and how often. The first number determines the loot table used, while the second number determines the chance per hit.
100.xx or higher seems to only produce antitoxins
1.xx or higher, up to max 10 maybe? Seems to produce all random items EXCEPT u-iso
0.xx seems to enable every drop, including u-iso
x.00 seems to equal 0% chance of items dropping per hit
x.99 seems to be 99% or maybe 100% chance (I'm not sure it's linear, I think it's a multiplier function so 99 actually means like 10000% chance probably, which is irrelevant)
The "<inCombatDropRateKo>" string doesn't seem to do anything. Might be a redundant code from an earlier version of the game because I tried setting it to 0.00 and it had no effect at all, items were still dropping 100% of the time.