Wasn't there last weekend but I've done a couple of overnight investigations at similar sites and the pattern you're describing sounds familiar.
That heavy pressure feeling in certain rooms - I've had it at old asylum-type buildings before. Whether it's genuine paranormal activity or just the psychological weight of knowing what happened in those places, hard to say honestly. I try to stay sceptical even though I'm deep into this stuff.
What I will say is if you were picking anything up on a spirit box, don't dismiss it straight away. I run a Shack Hack myself and the hits I've had in emotionally charged locations have been noticeably different to baseline noise. Still not saying it's definitive proof of anything, but it's worth logging.
Waverly Hills has a reputation that arguably works against proper investigation - too many people go in expecting something, which clouds everything. Did you have any equipment running or was it just the standard tour setup? That matters a lot for how seriously we can take what you experienced.
Anyone else been recently? Curious if the fourth floor is still the hotspot everyone claims it is or if that's just tour guide mythology at this point.