In need of advice: amplifier

Do you need more channels in addition to what the Proceed Amp5 provides, or are you just unhappy with it for some reason?

This listing is a 4-channel, but you could always leave one unused.  It uses the Hypex amp modules which are considered to be some of the best on the market:

https://www.audiogon.com/listings/lis8h697-ati-544nc-l-k-multi-channel-amps

I  would like to have a little more power in front.
Do you  thinks is enough with the Amp5 ?

Since you already have it it wouldn't hurt to try it out and see.  Focal rates them at 89db efficiency, which is slightly above average.  I can't find an impedance/phase graph for that particular speaker online, Focal says 8ohms nominal, 3ohms minimum, which is a pretty low dip for something 8ohms nominal, but without looking at measurements it's hard to say how hard a load it will be to drive.