As mentioned by HDNitehawk, the macro possibilities were also why I was looking at the EX but stability is something I would prefer not to compromise on. I didn't realise that it might be the case; thanks for the info.

Also, I didn't consider the L version but its extra 20 cm for only 5 cm when closed might come handy... I think I'll go like jrw with the 3541L. It's true that it's 2 kg but it will cover most of my needs and for the other cases I still have an old Velbon which is not great but very light.

For the macro/very low positions, I'll probably try the reversed column setup and the ARCA SWISS rails as I have an ARCA SWISS ball head any way.

Thanks for the comments! TDP is always helpful