Allyp
To be really honest you need to cut the carbon tube out – Take seat off and just leave the post – Cut a grove inside the tube below the frame and then use a screwdriver and hammer to smash the tube into bits – Also you need to take you bottom bracket out as the bottom end of your frame will be full of carbon bits –
I have had two carbon EC90'S stuck at a cost of over £200 !! 😳 and i have tried everything instead of sawing – no end of people will tell you different ways to do it, but most of them will not work – I even soaked my carbon tube and frame in Coca Cola for a whole 7 days !! – It did not work – Good look….