I need help in my explosive arrow skill tree (HC)

i died some time ago with my lvl 91 explosive arrow marauder, i was using blood magic keystone and RT..
and now i want to do another explosive arrow build but i want to know if my skill tree is good or if i need to change something etc...

im using the GPM setup for explosive arrow and split arrow/ice shot with curse on hit + 2 curses.
And im using double curse + EE for more damage, i should remove them and put the points in other things or no?
And marauder is the best class for EA? Because i see a lot of people using scion now.

Tree:


Thanks.

tree looks fine, but you should save the duelist points