Definitely worth the the southern exposure and warm house to get those views, amazing! But you also had the passive solar in winter i would assume which would be nice.
Afternoon shade from trees is huge in keeping house temps down, especially upstairs. My sister in law has a 250 yr old farmhouse with mimimal to no insulation, but they have massive Maples that shade the house from like 1pm on, so it keeps it somewhat bearable.
I also rarely get lows above 70..think I had 2 so far. It was 71 last night. So I run window fans most of the time..but I will run AC if lows are upper 60s which brings high dews also if lows are that high. Cool nights in mid 50s to 60 work well like you said cooling house and keeping it cool next day. We also have insulated cellular shades and close them up and all windows shut to keep it cool. But like I mentioned being in full sun, that only buys so much time if temps get to mid 80s.