Although it can be jerky, I would suggest never skipping Spiderman. A revolutionary use of technology when it opened, even 25 years later it remains a brilliant ride.
RRR is the roughest coaster in the parks for sure. Plus they have seemingly cut back significantly on the playlist. But don't avoid it because of the restraint system - it's as safe as any ride out there.
BTW if you're looking at a comparison for roughness based on your experience, nothing at UO comes close to SOB. Then again, very few things ever built are in it's league for that. In fact, The Beast is probably rougher than any ride at UO.
But people often conflate roughness with causing nausea. The Hulk, for example, may bang your head a bit (it has over the shoulder harnesses) and you might get a sore neck or a bit of a headache, but it won't make many people sick. The Simpsons, or Forbidden Journey, are more likely to do that, because of their back and forth motion. We love both those rides (although we do often skip the Simpsons if the line is long) but I try not to ride either of them first thing in the AM.
OP - I haven't really touched on your original question about reservations/wait times. As I posted in another recent thread where someone familiar with Disney was asking about a planning strategy for Universal:
"I'm the planner. My (actual, real) OCD comes in handy I must say with Disney. I have guided us though three completely different ride booking systems - paper Fastpasses, MBs, and now Genie. Master of the refresh, using my wife's phone to watch time.gov, LLs, VQs, I've become an expert in everything. Have advised several other Canadian families on how to tackle what is frankly a byzantine, often overwhelming process - even written out itineraries for them.
For Universal, these are my strategies (which work year 'round - we just spent Christmas break there, which is super high season, but usually go when schools are back for the locals, like late August, or even September). Follow these steps carefully, and you're assured of a low-stress, go-with-the-flow vacation, with plenty of time to do everything you want, with maybe just a little planning set aside for Hagrid's.
Ready? Here goes:
1. Book a stay at a hotel with EPs.
That is all."