I see your friend's logic, but I don't know if it's the answer to your issue. A well-built Kayfun Lite will provide a totally different (not to be confused with better or worse) vaping experience than a Griffin, but if you're already used to the performance of tanks like a Griffin, you might find a Kayfun severely lacking. Couple things... Kayfun Lite is strictly a mouth to lung hitter, due to the tight airflow. That cannot be overcome regardless of how it's built. If you need lung hit capability, don't waste your time with Kayfun-type attys. Single coil deck means that yes, you will use 1/2 the juice your Griffin is sucking down, but also get (less than) half the vapor. Also, it was never intended for 50+ watt vaping. Its air and juice flow simply cannot keep up with those power levels. Finally, if you're married to max VG juice, expect to have some issues trying to suck it through the tiny juice slots of a Kayfun Lite.
Oh yeah...the bane of Kayfun funness...having to carry around a mini screwdriver and needlenose bottle for the stupidly designed refill port. Should have mentioned that first!
Were I to build a Kayfun with the above expectations in mind, I'd go 0.8 to 1.0 ohms, 26 gauge single strand Kanthal, I would use Rayon for wicking, and I would make sure the wick was just barely touching the juice deck (in other words, trim carefully so the wick hugs the side of deck and just barely touches the juice floor, as opposed to screwing on the "bottom of the chimney" ring and jamming the wick into the channels). I would then fill with 50/50 juice and vape at 25 watts max (or less) via MTL.
Not knocking the Kayfun. They were my babies back in the day, when velocity decks and 1 click regulated access to 200 watts, TC, and Griffin awesomeness didn't exist.
Personally, if you think moderation is the answer to your issue, I'd bypass the Kayfuns for something median to Griffin-ilk, but more refined than a Kayfun, like a Kanger Mini Sub. Still single coil, but with better air/juice flow, basic lung hit ability, and NO-STUPID-TINY-REFILL-SCREW.

There I'd build 0.5, 24 gauge Kanthal, cotton wick, and vape it in the 25-35 watt range, whatever ratio juice floats your boat. You're not going to get the vapor production of a Griffin, but it'll get you through the day without hassles. Mine still does...I love my RDA's and RDTA's, but a Kanger mini sub and ancient istick 50 is still what goes to work with me every day, just because it's so simple and hassle free. I can stealth-refill my mini sub with my hands under a table without even looking at it!
Juice...Been awhile, but I remember 5 Pawns as being way overflavored for my taste. Do this...try some 70vg/30 pg menthol. Even if you don't care for menthol, it's a flavor that tends to soothe rather than irritate your throat. If the harshness goes away, you can blame your issue on the 5 pawns, not the setup, which means I just wasted 20 minutes typing all the .... above.