As I said before, You can stay using Deathcool just do not let any air get into the system. Here are some good Deathcool pictures for you: http://www.sancarlosradiator.com/dex-cool_pics.htm
I have two 200,000 plus mile GM engines here that originally came with Deathcool. They are still running with no ill effects on "Green Stuff". I have a couple of others, including my Colorado, that have less that 100,000 miles on them using "Green Stuff".
I have friend that runs the maintenance operation for a large power utility. All company owned vehicles (cars, small trucks, and large trucks) have their cooling systems drained at the two year point and replaced with green stuff. After that the coolant is never replaced again because they usually do not go over 7 years total before they wear out and go the auction or junk yard. The exception is some special use low use equipment which is on a 5 year coolant replacement schedule. The only thing they have in the shop is low silicate green stuff which comes in 55 gallon drums.
BTW, "Green Stuff" is usually Ethylene Glycol Based. What you want is Low Silicate formula. Most "Green Stuff": sold today is low silicate with extended life corrosion inhibitors for aluminum engines. The usual reason for changing antifreeze is to replenish the worn out corrosion inhibitors and remove any contaminants.
If you want to a quick way to determine if your antifreeze is worn out is with a multimeter. Ground one lead and stick the other lead in warm (NOT HOT for safety reasons) coolant in the top of the radiator. If the meter reads .1 to .5 volts the antifreeze is OK. .6 to .7 volts the antifreeze is marginal. Anything .8 or over should be changed immediately.
The Power company also does not balance tires. They use balancing beads inside the tires. I have the same beads inside my motorhome, my trailers, and the rear winter tires that I use on my Colorado.