Negative Magic Bonus!

I'm planning on stun/alching with lava staff and tome of frost and I can't get the -65 magic bonus to splash 100% I'm wearing robin hood hat(-10) ranger boots (-10) iron pl8(-30) iron platelegs(-21) royal vambs(-10) which comes out to -81 but staff and tome bring it upto -61 any ideas?

 

Im afraid with 1 defence its hard to get -65, you need to use an iron kite shield or something as well to reach it, you might have to forfeit that tome of frost, water runes are dirt cheap anyway.

 

I've been looking for something that will lower your magic more than you have currently but it's impossible. You'll have to stick with paying for water runes which aren't that expensive.

 

Either a) raise you're defence, as 1 defence is ruined as soon as eoc comes out
B) Wield an iron kite shield and just pay for water runes, it's not like they're 250 each!