AFRs after injecting water.

[EVILLUSION]

thread revival time, I have a LC-1 WB in my Evo and had it tuned to 11.2 on PULP anyway I proceeded to tune it to 11.5 with water/meth but had alot of trouble trying to introduce any timing to it as it would knock.
At a recent dyno day, my WB read 11.5 as i had tuned it to, but the dyno one read 13.8 and the car was down on power.
I put my non-water/meth fuel map back in, which was approx 8% more fuel on the fuel tables tested it no water/meth and it read 11.8ish (hot day autronic ecu charge temps etc) turned on the water/meth and the WB read 11.5 again, I added 2 deg timing and picked up 50kw on vdr.
Is it normal for the WB to be affected but the water/meth, what can be done to compensate for it.