weed to butter ratio?making big batches of butter and need a bit of help.

hello everyone. im making a couple batches of butter in the next day or to and i just have some questions and need some verification's before i begin. im a bit paranoid as 3 oz of old herb ive been saving up is at risk and alot of money could be lost if i fuck it up.

my first question is would an oz and half of good herb suffice for a pound of butter?alot of my research says 1 oz of herb to a pound but id like some extremely potent edibles.

i was planning on decarbing the bud slightly by putting a half oz in a foil pouch at a time and putting it in the toaster oven at 150 for 7 mins the first time then 160 for ten minutes a second time.does this sound right?should i increase or decrease temps and time?

i am going to be combing the butter and weed via double broiler, with a candy thermometer and i have an instant heat gun that detects temp. here is how i have this played out in my head.
melt butter and stabilize temp at 180.add decarbed bud.stir constantly and keep at 180 for 6-8 hours.allow to cool then pour into Tupperware to be put in the fridge for 24 hours.
next day: remelt the butter in double broiler and stabilize temp at 190. let mixture "cook" while stirring for another 12 hours.as the last hours are approaching increase temp and stabilize at 200 never letting it get above 220 as i believe thats the first temp that THC starts to vaporize at.when 12 hours strikes turn the heat off put the lid on and allow to cool.

i was going to strain via french press and Tupperware it up to solidify in the fridge.

does it sound like my end result will yield some bomb butter thatll put you on your ass or does it sound like im talking out my ass and need to do some more research?

any help is appreciated as i should be starting this tonight or tomorrow morning.