A full CLA will help the shutter operate at consistent times; you won't have to click the shutter a few times to make the lubricant fluid again...

The "A" in "CLA" should stand for "Adjust". It quite often means "Assemble". I just got hold of a repair manual for Compur shutters through eBay, so I'll now try to CLA the worst one of mine. It starts off at about 15s on the 1s setting, then speeds up depending on use, temperature and (probably) mood. After a few clicks the 1s is about 2, the 1/10s is around 1/2s, and the 1/200s is spot on!

On the other hand, I have a 300mm f:4.5 Xenar in a Compound #5 shutter which is within 10% at all times (I had it measured). At around 1kg the lens is a bit heavy, so I don't bring it unless I also bring the 5x7" Technika (7kg). That combination really precludes walking, so I bring a 121mm S.Angulon as well...

For travelling light, I have a Voigtländer Bergheil 9x13cm plate camera, with three film inserts. Total weight (including 150mm Heliar) - less than the 300mm lens alone