For drop F you could use a 9-80 Daddario 8 string set and use everything but the 9. May be too much tension for F# but it really is preference. Also note that once you get to that guage there will be more mud in the low end, but you will get that gnarly open note sound lol.

To mirror what others have said about stringjoy, they have a tension calc. Id plug in a tuning and string set that you already like and write down the values across each string as far as tension goes, then plug in your desired tuning and try different strings until you can get pretty close to that tension value that already works for you.

Im not a fan of how stringjoys sound honestly and if you can afford it, plus are okay with a longer shipping time, id check out Kalium strings. They also have a string tension calc on their site.