I would say, if anything, FOLLOW YOUR OPERATIONS MANUAL guidance, or failing that, manufacturers recommendations. Not all aeroplane types are the same, mine for instance requires me to SLOW DOWN in severe turbulence, not 'if anything keep speed up'.
Fair enough. but lets just say you've slowed down, you now encounter severe turb and your lower speed is not helping. you can't slow down anymore and the last thing you want is to stall. all i'm saying is i'd rather be over speed then under speed...
but as you say, follow your SOP's. they're there for a reason

.