SET 45 Amp Driving Dynamic Speakers

I'm reading this, almost midnight west coast time, doing all kinds of experimenting with my amps and speakers and iPhone spl meter.  I have  new Thomas Mayer 45/2a3 and a Slagle passive pre. I don't listen loud average 75-80.  My speakers are in the 99 db sensitive range. Like other I'm happy with my 45 tube and what it does for me, I think.  I've listen to a few rock and roll songs over and over. The 45 and peaked out at 87. it was more that I was comfortable with... and according to @atmasphere  its because of distortion and not because its too loud? neither the passive pre dial or my  digital volume on Roon was to the max. I then put the 2a3 in to see if the sound was more dynamic because i was not clipping or now there is less distortion? Listened to the same song. Probably annoying the neighbors now.... and i peaked out at 89.5. it felt louder but i surely it can't be getting distortion, I'm just having a hard time understanding.  Its just math right? watts, listening level, dynamic range.
 

thanks guys. I appreciate you sharing and helping me understand. yes c weighting,  So this morning I put in my 300b line magnetic amp.  And 90 dbs was really loud for me still... 87db with the 45, 89db with the 2a3, and now 90db with the 300b. the LM amp has a gauge and it never went above 2 watts. I wonder if that's accurate?  Going against some of what is said here i don't think my problem is distortion. Just loud music.  :)  I'm going to see 9 rock concerts in the next couple weeks. I'll see what the levels are there. I've seen the same band more than 300 times so i'm familiar with the loudness levels  at different areas of the venue and my home listening.  It will be interesting.