 Re: extending water based inks
The above threads might help, but since they're mostly focused on plastisol, might not (waterbased is mentioned though, so they might be helpful - do give them a read).
When thinning opaque ink in the past I have used a small amount of ammonium sulphate. It gets it flowing without noticeably sacrificing opacity.
I haven't tried thinning opaque inks with transparent extender, but it should work fairly well. Not much point adding more opaque extender, since it won't really thin them. Very small amounts of water can be useful to hydrate inks, though I only use that on opaques when they're drying out (rather than when they just need to be thinned a bit).
I tend to go by feel rather than precise measurements. I know that's anathema to some, but you just know when it's right and when it's not (or so it seems anyway).
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