These are excellant amps. Capaciters don't like to sit unused and there can be some degradation but if you like how they sound then go for it. Also, don't be so worried about power. If your speakers are not clipping then this might not be too mush of a worry.
I would, however, not leave them on unattended until you are sure they won't overheat.
I would, however, not leave them on unattended until you are sure they won't overheat.