The red pivot has too much friction in that model. The wheel tooth is going to slide (scrape) for the whole distance of the mating flat. You’ll find in modern clocks that those would be sharply beveled and typically mounted at an angle to the wheel toothface. You would want to cant it 45 degrees or more. They’re virtually points of engagement (even with width they’re only a “line”) vs a flat sliding action like the drawing will result in.
I am mostly a watch guy where we deal with incredibly small tolerances but some things are carried over from clock making and then get tweaked to fit the smaller form factor of a watch. Pallets in watches are very often stones (artificial sapphires) which lend themselves to high surface polish, minimal friction and lubrication stiction.
The deadbeat movement should be fine for your purposes, I think it’s coming down to the friction forces you’ve got robbing the power from the pendulum.
Gravity escapements can be very dirty from a friction standpoint, they often have an order of magnitude excess power from the dropping weight vs what’s needed to power the clock mechanism. So that’s always an option. But you wouldn’t have learned nearly as much had you started there