I had the 5s which I now use on my decks and have Mackie Hr824s for production. The 5s are fantastic speakers especially for the price. However due to the smaller driver they lack at sub frequencies, that's why they have the front facing port to enhance lower frequencies. This however can colour the sound slightly. What I used to do when mixing down would be to stuff some sponge I to the port to help give a slightly more transparent low end representation. Hope that helps.
I have some Rokit 5's also, if you're finding them bass heavy be careful what you are sitting them on.. I know it sounds trivial but even desks can totally change the sound. My glass desk back home massively resonates the bass in comparison to at uni. Grab some stands off ebay for like £30 well worth it!