Help a newbie understand

So the pandemic had me listening to a lot more music and as a consequence, I sold my 30-year-old but still functioning Snell c2 mk4 speakers and Adcom GFA 555 200 watts per channel amp which together sounded great ( to my uneducated and now failing hearing ) playing my digital library of CDs.I wanted to try something different.
I replaced them with Canton reference 9k monitor speakers ( which can handle 200 plus watts and a Technic su g700 integrated amp. max. 70 watts a channel. These also sound great in many different ways. By the way I bought both on Audiogon.

What I miss in the new system is its ability to play loud( I'm old and going hard of hearing) this has led me to play the amp at levels between -10 and 0 per the amps "wide range scale peak power meters"  and at those levels, the needle occasionally spikes into the region slightly above 0  for fractions of a second to a second or two but not ever reaching +6( the next demarcation on the meter) per the integrated amp's meters.

My fear is frying my speaker's voice coil etc. by clipping when I play at the above level so I have two questions. First, is the headroom sufficient to prevent frying my speakers given the listening level and the volume's slight venture into going over 0 on the meter and second how do I read this "wide range scale peak power meter"?
The peak power meter's main demarcations are as follows-50/0001,-40/001,-30/01,-20/.1,-10/10, 0/100,+6/200.and under those numbers is the symbol db/%. 
So I went online but could find nothing that I could understand relative to how to read this type of meter. For example, if the relationship is dB/% what does  -50 represent and the % 0001?, what about 0/100,+6/200?The top numbers make no sense to me -50? -50 what no watts who's on first.
Thank you in advance for your time and expertise.