The J/22 is a difficult boat to manage in heavy air ( not as difficult as a J/24 which are notorious for wipe outs and sinking ) . They aren't particularly stiff boats, being designed with serious hiking in mind.
If heavy air on a J22 - take in the jib and sail under main alone. Try hard to keep the rudder in the water - easing the main such that that luff luffs and using only the leech for power usually provides enough speed and control.
BTW nearly all modern boats sail poorly and slowly when heeled more than 10-15 degrees.