edit: 3) Will driving a 8 ohm speaker that has a 6 ohm minimum impedance be a problem?
Speaker = http://www.troelsgravesen.dk/Jenzen-NEXT.htm with woofer http://www.troelsgravesen.dk/Jenzen-CA_files/CA26RFX.pdf which is a option for the design.
Lets save question 4 for later :)
During my loudest listening sessions, I am measuring 95-97db with 106-109db peaks. Its taking about all of the 100 watts I have to get to this level. Its doesnt sound clipped at this level, but there is a hint of strain.
I dont want the xtra power to go louder than this, rather be able to accommodate this level with more headroom and ease for the amp.