I tried barbless about 40 years ago, lost two fish in 2 casts and vowed I would never use them again. However, when I moved to Lincs in 2002 and started fishing my local commercial I had to follow the rules and use barbless. 20 years on and I would never use barbed hooks again. Easier unhooking, less holes in jumpers and no hook lengths hanging in keepnets. Fish lost due to the hook slipping is so close to zero as to be negligible.
I had a similar thing happen back in the 70s. Barbless hooks weren't as popular then, but I'd tried them and bought into the 'more humane' message that was going round. I swore by them, and in an attempt to persuade my mates, I would hook a fish, put my rod in the rest while I lit a cig, and show that the fish was still hooked when I picked up the rod. Then during an Embassy/Woodbine Challenge qualifier on the Wharfe at Ulleskelf, I drew a decent dace peg. I kept losing fish after fish, as they shook the hook. I was using the same tackle that I'd used dozens of times before, and tried a change of hook size, and pattern, as well as the usual shotting, and float changes, altering angle and force of strike, but still lost fish. I didn't have any barbed hooks of a suitable size, and weighed in just under 4lb, having lost at least 2 to 3 times that weight, and missed qualifying by a few ounces. That shook my confidence in them, and to this day I use either whisker/micro barbed, or squashed barb for all my fishing.
John.