If you buy a roller furler with the idea of partially furling the jib to shorten sail in heavier winds you don't want a CDI. While they work well, they aren't designed for furling like say a Schaefer Snap Furl is (which is another flexible extrusion system) or a more expensive system. Always best to shorten sail when the wind pipes up. With a fractional rig, most of your horsepower is coming off your mainsail, so reef that and keep the jib up as you will have more control of the boat going to weather. A fractional rig would not have a 150% genoa because it isn't designed for it. More likely a 135% or less. I think the Capri is pretty simpler rigged than some other boats, but if you had a traveler, then you would lower that to leeward in the heavier stuff and if you have genoa tracks, you could also adjust them aft to help depower the headsail. Then there is steering techniques to learn like sticking the jib high into the wind - what I call feathering - where the inside tell tales are flying up and the outside are straight back. You can have amazing control if you learn how steer in the heavy stuff. Lastly, yes, you can knock your boat down if the wind is heavy enough and you aren't quick to dump the sails. But, it will come back up unless you filling the interior of the boat with water. In extreme conditions, you shouldn't be out there, but if you are, then close up the cabin.