FYI: I was looking at using the 90C table listed conductors myself, but admit I forgot about terminations being rated for 90C. Anyhow, I called a couple conductors suppliers/manufacturers to ask about the differences between THWN (75C) and THWN-2 (90C). To sum it up, pretty much all THWN conductors #8 and above are rated as THWN-2. Seems to be an industry standard from what the suppliers/manufacturers informed me.
Also, If I recall right *not that my memory is the greatest at times, lol*, I think the THWN is listed for wet/dry conditions at 75C and only dry conditions at 90C whereas the THWN is listed for both wet/dry at 90C. Again, what the suppliers/manufacturers informed me.