First, you don't need separate xo for the speakers. I have a Pioneer SC 35 and very large floorstanders, Klipsch RF 7's, 250-1000 watt, and low extension of 34 Hz and I run all speakers as small and xo at 80. I have 3 subs in the system. If the OP xo at 80 the surrounds should not be in any danger. Let the subs do what they do best, handle the bass.
Klipsch RF 7 based HT 7.4, Pioneer SC 35, Acurus Five 200 amp, Chase SS 18.2(2), VS 18.1(2), Samsung BDP F 7500, Asus/My Book Live HPC 4 TB
Yaquin VK 2100 amp, McIntosh XR 5 speakers, Samsung BDP F 7500