I don't claim to completely understand the relationship between speaker sensitivity and amp output power but there are some observations on that in this review of the Raven Audio Nighthawk III driving Dynaudio Special 40s which are rated at 85dB, similar to your speakers.
https://www.stevehuffphoto.com/2019/10/30/hifi-the-raven-audio-nighthawk-mkiii-integrated-amp-review/?fbclid=IwAR2Wt9rCAq0WaQYVJh22kZRVydhh7ExAT-cpkHJHVCwRCn1glzU2FxUn4LY
https://www.stevehuffphoto.com/2019/10/30/hifi-the-raven-audio-nighthawk-mkiii-integrated-amp-review/?fbclid=IwAR2Wt9rCAq0WaQYVJh22kZRVydhh7ExAT-cpkHJHVCwRCn1glzU2FxUn4LY