So, you are a giant then? Had a friend/neighbor who was 6'7", his 7 iron was about 180, 5 iron about the same as you report.
All kidding aside good for you being out on the course. It's one of the best things I know of.
Managed to get out for 18 holes in drizzly rain yesterday. All things considered it was a good day.
Covid golf is a little different. I had to make my own rules decisions, since nothing was official it doesn't matter. I like following the rules so I know how well I did but it just wasn't...
Not even going to try the burr mill set at it's widest gap? Just a few grains? Nothing says it will work but I would try it if I was in the same situation.
Actually I wouldn't, I'd go to ebay and get a Corona type mill but I know that's not where you want to go even though it will set you...
I would take it as a sign to buy a Corona style mill. I understand you don't want to buy a mill. Should be less than $35 shipped from ebay, will last a long time.
Otherwise maybe you have a burr coffee mill or mortar and pestle?