115cm shaft is perfect for 80cm gun. Keep in mind that new omer guns measure 5cm less than old omers. E.g today's 75cm gun will refer to almost to 71cm of old models. 90cm will reffer to the old 86.
In past models, omer sized their guns according to the band strech which i belive it was better way and common in euro manufacturers, but now omer size the guns according to their barell length but it actuall adds the length which you did not get any benefit from, like the part in the hande etc...
anyway, i used 115cm spear in 75 (new) omer and it was good, now i am using on it on wood gun which has 80cm band strech and its even better.
I think that 6.25mm shaft is perfect compromise for med. Tell me honestly how many times in a year you see 10-20kg AJ or grouper??? Even if you see it i belive 6.25 will be enough to nail it
