If you make the e liquid at 7 ph, it will taste like pure water.
I am pretty sure this isn't the case - but you were probably joking?
I am still dithering about what to do with the main blend - I seem to be having a "tastebud-crisis" wrt sweetness, so I figured it would be better to wait until that is over before I go mucking around with it anymore.
But I can offer a small update on this:
I did make another, less theoretical, juice yesterday too. Starting with the slops from my first blend I did:
~1.2 ml of the old blend
~0.5 ml PGA (washing out the old bottle)
2 ml of my first extraction (details
here)
3 ml 13mg/ml unflavoured 85/15 PG/VG
4 drops of 5% orangeflavoured 10mg/ml 65/35 PG/VG juice
1 drop 5% vinegar
1 drop EM (in PG)
As I wrote I felt it was nice, but a bit weak on the orange-notes and far too thin in viscosity.
So I added:
1 ml slightly thinned VG,
1 ml 13mg/ml nic,
1 ml 17% First Extraction in 50/50 PG/VG, and
0.2ml 5% orange at 10mg/ml 65/35 PG/VG (this incidentally turned out to be 6 drops, so now I know that my plastic bottles delivers 30 drops/ml at 65/35 PG/VG at a temperature of around 22 degrees Celsius

)
As this is a "slops bottle" and I had been vaping quite a bit from it, I have no idea exactly how much was left of the original ~7 ml (which is in itself a very very approximate calculation of how much I had) - for some unfathaomable reason I have also chosen to use an opaque plastic bottle for this [shakes head].
Anyway, the result is raaather nice.

Still a light and mellow vape, but the orange is now noticeable (though I probably wouldn't identify it as orange, it is more like when you use dried bitter orange zest as a spice in spice cakes or mulled wine*) and the consistency is much better.
Interestingly enough it is rather different in a 2 ohm carto (Kanger this time) than in my eGo-T: Much more tobacco-y in the eGo, and much "juicier" and more mellow in the carto. This might in part be because the eGo-T previously had a rather heavy tobacco-coffee in it, but after nearly two full tanks that shouldn't really be affecting it that much anymore.
I don't think this slops-bottle is "finished" as it is now, but I can't really decide in what direction to take it next. When I vape it in a carto I sometimes feel it would be a good idea to beef up the "dry tobacco" (maybe add some of my second extraction, or play with a drop or two of some FA tobacco), but when I vape it in the eGo-T I'm thinking more of adding some subtle hint of "warm" or "round" - chocolate, vanilla, or maybe some of that nice Hangsen D'doff concentrate...
*Ahaa! Trying to find an English expression for what in Swedish is called "pomerans-skal" and a common spice in glögg and gingerbread among other things, led me from Bitter orange to something called Neroli, which I have seen here and there in listings of flavours/scents, but have never had an inkling to what it was. It sounds very interesting as a small addition to lots of things - both food and vape-able. Flavourart has a PG-based Neroli flavour, hmmm - my wish-list just grew a bit longer again. Sigh.