I rode tubulars for quite some time in the 80's and early 90's.

But, have been mostly on clinchers since then.

Tubulars were good for changing flats. Not bad for gluing and mounting. But, actually patching tubes was a pain.

I'm doing some experiments with tubulars once again.

A couple of things to consider.
Tubulars are some of the lightest tires/wheels. Clincher rims tend to be heavier. Clincher tires are often heavier. Plus, are you using the lightest tubes?

The new sealants are supposed to help reduce the need for changing flats. Especially the brands like Tufo without stitching.

Pinch flats were mentioned, and I believe they still occur, as there is a tube that can be pinched between the tire and rim.