I use the hop loss calculator in ProMash. It isn't variety specific but I feel it works well. I calculate loss from the date of purchase, unless I bought previous year hops (rare).
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I over build my starters and repitch yeast. I guess this could also be the problem.
Denny, I get the estimate FG from the recipe I am using. My beers are all finishing at 1.006 or 1.008. Really thin, no flavor or aroma. My efficiency is usually between 75 and 80%
Biggest mistake was not with my own beer, which made it worse. My good buddy who is newer to brewing, decided to cold crash for the first time. I gave him some basic instructions, but didn't think about telling him to pull his blow-off tube off. Turns out he had his blow-off tube in a 5 gallon bucket of iodophor mixture (don't ask me why). There was at least a half gallon to a gallon of sanitizer sucked into that batch. Needless to say that batch got dumped.
It was a batch that he and I brewed together for a shower being held at his house. Only reason the shower was at his house was because of the beer. So everyone was expecting homebrew. The batch was dumped 3 days before the shower.
Luckily I had enough in my own kegs to bring to his house for the shower.
That's a mistake I've made before and am very careful about personally. Although when I made it, it was only with a small amount of star-san where maybe a few ounces got sucked into the beer.