Ball pythons vs. boa constrictors - key differences in care?

[RedRabbit]

Currently, my only snakes are my two ball pythons. I am very happy with my duo, and haven't really felt the need to add any more to the family, no matter how gorgeous the morph. (Though the Blue Ghost from 8 Ball Exotics and the Enchi Leopard Lavender from Justin Kobylka get shout-outs for absolutely blowing my mind with their looks.) If I were to add another snake to the family, I would be looking at a boa constrictor; as with my BPs, I would ideally like to start with the snake as a baby or juvenile/sub-adult. So, with that said, I would love to know what to expect and prepare for. I've read through the stickies in the RTB (BCI and BCC) section of the forum, as well as some additional browsing, and this is my impression so far ...

Similarities to BPs:
- Humidity requirement - around 50-60%
- Temperature requirement - 78-80 F ambient
- The baby boa tub setup sounds very similar to what I have for my BPs too - water dish, couple of hides, thermostat-controlled UTH on one side, some fake plants

Differences from BPs:
- Much larger max size as adults. Obviously. Would need to plan accordingly for enclosure space and feeders (jumbo rats, maybe rabbits).
- Temperament - more active, less timid. Will likely require a bit more attentiveness when handling, compared to the sedate little "plop" of a BP. As adults, they won't care about utilizing hides as much as an adult BP would.

Questions I still have:
- For females - there have been cases of BPs laying unfertilized eggs (with no prior exposure to male, no retained sperm plugs). I am solely a pet-keeper with no interest in breeding snakes, so my main concern in this regard is the presumed risk of becoming egg-bound that might come with this. Since boas are ovoviviparous, is this a non-issue?
- Morph color retention - a lot of BP morphs are brightest as babies and mellow out with age. Does this occur with boa morphs as well? What boa morphs are known for aging well vs. fading/changing significantly?
- Health issues - if I get a boa, I plan to quarantine it away from my BPs for at least 6 months to 1 year, as I have read that boas can carry and hide diseases that could quickly decimate a BP collection. In addition to the usual precautions for mite prevention, and monitoring weight and poop to rule out intestinal parasites, what else do I need to keep any eye out for?

Any corrections, clarifications, and additional advice would be much appreciated!