Thank you Hillbilly_Hybrid for the very helpful reply, very much appreciated.
I was able to talk to the service tech and I had him read your reply to see if he checked the things you mentioned. He mentioned that the computer says the Hybrid battery is reading 304 volts and all the cells seem to be in normal range and the temperature sensors didn't or don't show signs of getting to hot.
That mentioned, (Plus thanks to you for describing the actual area to look as I for some reason thought the area to keep clean/clear was the front area where your feet would rest) I did find 2 1/2 rows of the 3 to 4 rows of wire meshing on the left side (closes to door), the lower vent holes were covered with hair type substance while rear vents only had one piece of styrofoam type material but no hair. I showed the tech the hair and he didn't seem to think it was enough hair to cause a hot battery running problem.
Before I had a chance to clean the hair and install the new upgraded 760 CCA vs the smaller 615 CCA 12 volt battery that typically comes up (on the 08's at least) when they run the vin number for parts look-up, At one point in the heat of the day which was right near 100*, It ran the worst "I" have ever experienced but my wife is the main driver and she has experienced it while it's cooler both morning and evenings.
For me today, It ran pretty well in the morning hours with very slight hesitations intermittently but on the way home it stopped going into Auto Stop, then the rough idle started up. I parked it in the hotter garage than what was outside for an hour and when I put it in forward gear and gave it less then quarter throttle I was lurched forward as the SUV did a hard nose dive plus you could hear a hard clunking sound from what seemed like the transmission area each time mainly just do to the violent nature of the lurching.
Also while it was running rough, If I held what would be roughly a normal working 15 MPH
slow speed roll, the engine RPM flare went up quickly to around 2000+ RPM but I was only at a slow roll of 3 MPH
and not gaining speeds at higher RPM's.
After the day and the SUV temps cooled off some, I installed the new recommended 12v battery and cleaned the vents... While it wasn't running as bad as when it was hotter, the idle was still kind of rough, still a little lurchy and not going into auto stop.
If it don't go into Auto Stop, you just know it's not going to run right.
Without pulling the Hybrid battery box and testing each cell independently like I've recently seen videos online of Toyota Prius owners doing, Not so sure of where to go next. Maybe the copper buss bar connectors are becoming corroded?