Update:
Finally got around to changing out the oil sending unit and experimenting with my coolant system. As suspected I was using the wrong oil temp sending unit and once changed oil temp is staying steady @ 194F
In regards to the radiator and trying different combination's of anti freeze Vs distilled water here are the results:
50/50 Tap Water + Dexcool (GM Recommended Antifreeze)
First test: 30min idle time while sitting in the garage with no incoming air (Outside Temp 60F). Fan's pulling in air and pushing over the intake and engine. Temp range after heated up was 198~205F. Average coolant temp @ 200F.
Distilled Water
First test: 30min idle time while sitting in the garage with no incoming air (Outside temp 60F). Fan's pulling in air and pushing over the intake and engine. Temp range after heated up was 194~198F. Average coolant temp @ 194F.
Distilled Water + DEI Radiator Relief
First test: 30min idle time while sitting in the garage with no incoming air (Outside temp 60F). Fan's pulling in air and pushing over the intake and engine. Temp range after heated up was 192~194F. Average coolant temp @ 192~194F.
Conclusion:
Distilled water significantly reduces max operating temp by 7 degrees while DEI Radiator relief provides an additional 4 degree and safety for lubricating the system. Since I live in Florida and do not need to worry about snow, ice or freezing I see no benefits for using Dexcool.
Plan to do some driving tomorrow and will monitor the performance.
