I started slightly lower, maybe 4.5 grams per 10 gallons. I'm willing to try more, although that stuff isn't cheap.I hear ya but hope that changes.
Do remember the dosage is based on the brew. Higher ABV and hoppy need more. I am like 6g for 5G on IIPA. You'll know if you're using enough tho, the clarity is pretty obvious.
1hr stir plate? New to me. My info says to simply rehydrate cool liquid to avoid clumping and use 10m prior to KO/I do half way into whirlpool. Mfr Rep (Ashland) also confirmed. Interested tho. Honestly, I love the stuff.
My rep told me differently, but maybe because I used it cold side. My method:
boil @ 2 cups of distilled water for 3-4 minutes to remove O2 and to sanitize the water. Cool water below 80F. Take an 8 ounce Kerr canning jar (clean and sanitized) and add 10-15 grams of PVPP and a sanitized stir bar.
Add the cooled water so the water completely fills the jar (the water will be slightly above the rim) and let the air come out of the PVPP. This takes a minute or so as the PVPP absorbs the water. As the air comes out, add water if necessary. Place the cap on jar, this should force the excess water out of the jar (the water will be slightly over the top of the lid due to water tension). This will remove nearly all air from the jar and prevent O2 from getting into your beer.
Put on stir plate for @ 90 minutes. The PVPP needs to be in "aquauous suspension", which means that none of the tiny beads should be stuck together. Mixing it in with a stir plate does this.
Tip the Kerr jar upside down so the stir bar sticks to the lid, add to beer, mix thoroughly. PVPP works best when it's mixed in well.