Few answers;
From the break down towards the foot of the mast the ID of the mast section is 50mm and the wall thickness is 5mm so using a 1:10 taper the outside skin will taper out to 50mm for the repair.
Carbon Uni repairs are notoriously difficult and with your method you will get a very unique bending of the mast under load. The repair chamfer angle for most manufacturers carbon Uni strand is 100:1 and not 10:1 and to maintain strength to adhesion correctly this should be attempted as well as possible. From a practical point it is nearly impossible to do on a round surface. Best of luck but do not be dissapointed at the bend characteristics of the repaired mast as from experiance it is very very difficult.
