I had the similar experiences about the trigger point.
Currently I use 1*0.5 at pre-turbo & 1* 0.6 at pre-TB, triggered at 10psi, max boost around 18~20psi.
I can be sure that the turbo spools up much more quickly in the 10~20psi region than the 0~10psi. Probably, that's the work done by water.
Which stops me make it earlier is the worse atomization in the low DC injection. I'm a little worrying about the larger droplets caused by this, especially pre-turbo.
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'97 Fiat Punto GT
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