I removed the external springs on the pumps and used lighter internal springs. That and being very careful with the cable routing made a huge difference. Also much cheaper than replacing with flat tops and custom cables. Here’s a link : Removal of accelerator pumps - Le Mans 1000
Heres another: Lemans 5 aftermarket carbs | GuzziTech Forums
I used the medium weight springs suplied by Eurocarb; Internal slide spring - Medium (#8532)
They’ve been in for seven years and have never caused a problem.