Went back in the thread and saw you commented on the brake calliper reach. I'm now going completely insane over this.
Just tried the Mafac Racer centre pulls - the rear is perfect, brake pads sit about half way, the front though the pads sit right at the top and I can only just get them to hit the 700c steel chrome rims where they should be - I may even need to file the brake hole a little.
View attachment 670522
Definitely don't want to mess around with the Mafac Competition centre pull short reach; the straddle wire is a nightmare scenario.
Another issue I've come across is the headset mounted front cable hanger for the Mafac centre pull. It raises the overall stack height a bit too much to properly fit the top lock nut (only about 1 3/4 turns). My only way out is to replace the headset with the lower stack height one from the Gitane doner bike; the bottom race stack height is a good 2.5mm shorter.
Also tested the rear with a Weinmann 730 long reach, fits good on the rim, impossible on the front. Weinmann 500 short reach on the front is a perfect fit. I absolutely hate these brakes too, but will use them to get the bike rolling - I'm itching to try it and see if it's a good fit.