I like to max out my VG, and add distilled water to thin my mixes. The ratios vary depending on the mix since I'm going for max VG. As a general rule, I like to have 10-15% 'watery things', such as distilled water, PG, or alcohol. For example -
Mix 1
10% Flavor A PG
5% Flavor B VG
1% Flavor C Alcohol
This is a 10% PG ratio, so I would add ~ 5% water to thin the mix and the rest would be VG.
Mix 2 -
10% Flavor A VG
2% Flavor B Alcohol
1% Flavor C PG
Since this is 97% VG, I would add ~7-10% distilled water to thin it properly.
As for why I do this, it just feels better. Maybe I'm sensitive to PG, and I don't mean to offend any PG users, but PG is just really annoying on my mouth/throat. It's not so much a throat hit as it is a dry, scratchy irritant. As for the myths that VG clogs coil and mutes flavors, those haven't been true in my case at all. I've experimented with flavor %'s remaining the same between a 50/50 blend and a max VG blend, and the only difference was the slightly sweet nature of VG. I then tested out the clogged coil myth with a 90%VG/10% distilled water unflavored mix. The juice was crystal clear, tasted slightly sweet, and the coil has been running smooth for 2 weeks now.
I remember when I first started vaping and ordered a bunch of 50/50 blends and some 80VG blends. They both worked good but I preferred the 80VG because, as a new vaper, I was obsessed with clouds. Anyway, I got my hands on some Halo juice a bit later and just hated it. It dried my mouth out instantly and really annoyed my throat. Again though, it wasn't like a nicotine throat hit where it's satisfying and 'controlled' so to speak. It was more lingering and scratchy, and the dryness that it brought with it was too annoying to bear. It dawned on me that I couldn't select a ratio at their website, so I asked around and most people were saying that they use up to 80%PG in their mixes, so for me that was what really solidified my hunch that I'm probably PG sensitive.