Thank you. I'm about to start more than likely in January. I bought a huge supply of
juice to last me a minute but I'm wanting to get into this since I have a PG issue (The Itchies)...
Starting your mixing journey, while you
still have a solid supply of vapeable e-liquid, is not a bad thing.

It can really help to take the pressure off of "getting it right," right out of the gate. It provides the luxury of "practicing" with simple 1 and 2 flavor mixes, that may not be the most exciting mixes you've ever tasted, but still provide useful feedback... and still have more familiar/satisfying(?) vapes to fall back on.
And, as for the "itchies;" I had a similar challenge.
I have been
vaping since December 2012. My vaping journey led from lesser vapor-producing hardware (cigalikes to cartos), to higher cloud-producing set-ups. My personal smoking "trigger"(we are all different) happened to be the need to "feel" the smoke deep down in my lungs. The cloud rigs satisfied this need... I quit smoking, and never looked back. I began DIYing mid-3013, and was able to even begin tapering off the amount of nicotine I required to feel satisfied.
My problem manifested itself a bit differently. I was vaping 13-20mL of liquid a day (4mg/mL, max VG), and I started getting the old smoker's hack... heavy coughing, producing phlem (sorry; I know that's gross). I had a heavy chest throat the day, and I seemed to get winded easily. This seemed to be just as bad as smoking!
I didn't want to stop vaping (and not sure I could; even if I wanted to), but I felt like I needed to cut back my daily consumption. So, I decided to change the way I was vaping. I increased my nicotine level significantly (from 4mg/mL, to 18mg/mL). And, I ditched my cloud-producing DTL (direct-to-lung) setups, for low vapor-producing MTL (mouth-to-lung) setups.
I got my desired results. The high nicotine wouldn't permit me to vape continuously (without feeling queasy). And, the lower vapor-producing hardware, exposed me to less total vapor. All while still satisfying my nicotine needs.
My e-liquid consumption dropped from 15-20mL/day; to less than 3mL/day. The heavy chest, shortness of breath, and the hacks and phlem, all went away.
So... this ended up being the right solution for
me.
I have no idea, if any of this, is applicable to your situation. I only share my own journey (so far), to suggest that there a lots of different ways, that an individual can adapt vaping to best suit one's own needs.
Maybe, minimizing exposure to PG (by mixing max VG, or using PG alternatives like distilled water, and/or PEG400), is your answer. Maybe, reducing the volume you vape, can help. Maybe a combination of things, will be your personal ticket to "itch-free" success. Or, it could be something else altogether.
Just, don't give up! Don't get discouraged. Keep plugging away. Keep asking questions. Keep trying new ways. And, you will ultimately find what works best for
you.
I'm glad you found this forum, and this thread in particular. There is almost nothing vape related; that can't be discussed here. There is a wealth of experience, along with a diversity of viewpoints; from folks who are eager to share and help. Welcome!
Thanks. I usually use FA Marshmallow but am almost out and have TFA and the Purilum. It sounds like I can safely sub in the mix. I do appreciate the help.
I have routinely swapped, FA and TFA (not DX though) Marshmallow, without any significant/noticeable difference... at least to my sorry palate. As always, YMMV.

