AaronhomeIN,
I can offer a Southerners opinion...
Stocking rates vary depending on your objectives for them in the first place. Why do you want to stock Tilapia?
If you have significant algae problems and also artificially feed you may want to stock at the high-end rates of 15 to 20 pounds per acre.
If you are looking for good forage for predators, then 5 to 10 pounds per acre is sufficient, in my opinion.
If you just like them and want to observe, 5 pounds is plenty.
If you want them for food, go to your grocery store...they are very hard to catch.
The die off just isn't a big deal especially if you have predators present. LMB and HSB will do a number on the slowed tilapia and make good use of them before dieing. If you do not have predators and experience a sudden drop to 55 degrees and below water temps, then you will see lots of dead fish. However, Nature's clean up crews will quickly avail you of any problems. In my area, in a pond without predators, hundreds maybe thousands of dead Tilapia were consumed within two weeks without any offensive odors or any problems. We even had two America Bald Eagles pay us a visit, which alone was worth the price of the Tilapia.