Would a switch to Spiritual Weapon enable me to handle the 8 encounter day with only 3 short rest? I had initially thrown it out because the Nova attack sequence was bonus action starved. I thought by level 7 I would have enough spell points to quicken most rounds. But it seems that 3 encounters back to back is a common design pattern in campaigns.
Perhaps trading out Scorching Ray altogether? This trades frontloading damage for endurance.
At level 7 (presuming Warlock 2) you can Quicken twice per encounter without having to use a bonus action (and dump a 2nd level spell slot) to create more SP.
You dont roll from encounter to encounter either. In a typical ruin or dungeon environment you'll explore, trigger an encounter, explore some more, trigger another encounter, explore some more etc etc before hitting the BBEG at the end of it all, usually as your final encounter. In that time (in your standard dungeon level) you'll probably deal with around 6-8 medium-hard encounters (between long rests), and have around 2-3 short rests.
The above mirrors your typical dungeon, and adhering to the DMG median for the expected adventuring day.
Also note, an adventuring 'day' isn't a literal day. It could be a week of game time, or a month or whatever. It's the arbitrary amount of time between long rest resource recharges. Even in games that use the default long rest rules (8 hours of quiet rest) your long rests could easily be broken up by an encounter, or you might be racing against a 'Doom clock' and have temporal limitations and not have time to Long rest. Your DM could also be using a rest variant such as the Gritty realism long rest variant (making them a week long). In the latter case you could easily go a whole month without getting those Sorcerer slots and SP back.
Personally I use 5 minute short rests (a quick breather) that only let you spend half your level in HD each and cant be taken more than 1/ hour, and you can take no more than 2 per long rest, and I also use 8 hour long rests that do not recharge any HP, but do recover half level in HD (which can be instantly spent with no limit).
Some DM's like Rocket tag (they only run 1 encounter between long rests). I avoid these games like the plague becuase it's just a giant game of 'win initiative and mash the nova button'. I personally find them boring as heck, with no resource management and wildly imbalanced classes. But YMMV.