Thanks

I just added my stun and freeze up..

4.1, 3.4
2.9, 4.1
6.2, 2.9
3.9, 4.3

respectively on each char..

So as Kicksome suggested 4% of each for each char seems to be a good sweet spot - now I know I can reach that on just two items instead of spreading across four - I will have more upgrade options.