Yea it sits around 203 204 doing 70 on the highway and doesn't really pass that. Would like it to be sub 200

 

The IACV must have been stuck on the one side and when you did the work it got stuck one the other side, flipping the misfire codes. The front O2's sit on metal tabs which are a real PITA to get unhooked. Your issue was exactly the same as mine. you were 100% sure they were seated, when they were not.
As for your coolant leak, it sounds like something is not connected properly. Richard is 100% right about the 180* thermostat. Once you get that squared away, you may run into the "waterfall" sound. You may hear sounds of running liquid from behind the dash. What that means is there is an air pocket in the heater. You may have to bleed the cooling system multiple times to get it out.
Glad you are making progress

 

Richard Gallant is correct however you can get the grey 180 stat from Lucky 8 for around $60.

Note to future readers, there are at least three stats on the market claiming to be OEM 180 degree. The white ones do not work as well as this grey one which runs around 12 degrees cooler than the others.