The one from PetSolutions is 100% metro, that's the one I would use. As far as temp at 92 goes, I don't know. Be careful that the water stays well oxygenated at that high temp. And follow the directions on the meds for temperature.
A lot of discus owners buy their metro here:
http://www.jehmco.com/html/medications.html
And from one of the SD team members who has treated:
"I have used metro several times, all effectively.
Once on discus at 400 mg /10 gal , every 8 hours, for 3 days, temp 94 F for 10 days. Also mixed metro in food. Full cure"
And another:
"I have used metro for years, I dose at 250mg per 10 gals
3 treatments over 5 days 25% water change between each dose, raise the temp to 93 degrees. I find sometimes that it takes the discus a week or so to get back on their feeding but it has worked for me every time. I use a pill crusher/splitter to grind the tablets into powder disolve it in tank water in a bottle with a cap shake it up no problem"