Bill aka Wizard - welcome back!
Your 2-3 year absence hasn't slept through some unkept secret in driver technology. They're all still pretty much the same, although a few might look a little different.
If you're getting back into the game on more of an active basis, give yourself a month or two to adjust and get back into your familiar swing. After your initial period back - if you're still experiencing a notable difference in swing speed/carry distance - go get your swing speed checked. You might find that you no longer need a stiffer shaft, even though it might "feel" like it's a bit too whippy.
I downgraded from stiff to regular flex about 2 seasons ago and although I might still get a little quick on my transition and hook a shot every once in a while, overall - the softer flex has been much longer/straighter than the stiffer shaft I used to play.
But again - I would encourage you to give yourself a couple of months to get back into the normal routine before assuming that you need to change anything. Our knee-jerk reaction is to panic and make a change based on what might not be our normal swing starting out after a prolonged layoff. Allow yourself enough time before making that decision.
Hell, after just the typical winter layoff it takes me 2-3 months just to get back into my normal setup position at address, which tends to impact angle-of-attack, not to mention regaining my usual swing speed through more frequent repetition.