Tacking, making it or not...
When I converted my 7.1m Albin Viggen, Malena to JR (flat sail) after nine years with a Bermuda rig, I was surprised to find she had become reluctant to tack, something new to me in that boat. After I had a spectacular grounding of her, following a missed tacking, I developed a combination of habits when tacking:
1. Keep generous distance to lee shores if you can.
2. Fall off a bit to pick up speed before rounding up.
3. Round up by gradually, giving more and more rudder, to lose as little speed as possible.
4. If she stops at the top, grab the boom and back the sail gently. That was very effective with the flat sail (less so with cambered sails)
The tacking of the flat sail always ended with the boat falling off almost 60° before picking up speed.
When Malena was given a cambered sail, either with hinged battens or cambered panels, she became herself again and tacked smartly and settled at the intended course on the new tack.
It seems to me that with a cambered JR, the ability to tack is the same as with Bm rig, and simply depends on the hull: A boat with a blunt bow, light displacement and a small rudder is thus likely to fail when tacking against an awkward chop.
A possible advantage with the Bermuda or gaff rig is the ability to back the jib to get you over the top. On the other hand, that jib or genoa may also throw you over onto a new tack if the wind suddenly shifts. In confined waters that may cause more excitement than strictly needed.
Conclusion: I recommend fitting big, efficient rudders(s) on sailboats in general, and on junks and catboats in particular.
Cheers, Arne