Help please cooling

I have recently fitted a alloy rad & grs intercooler to my s2 it's now over heating!
This is how it's set up

The fan is 10" kenlowe I'm thinking that maybe one fan is not enough? Should the fan be sucking or blowing?
If I was to change the fan for twin fans what size fans fit 9"?
This is how it's set up

The fan is 10" kenlowe I'm thinking that maybe one fan is not enough? Should the fan be sucking or blowing?
If I was to change the fan for twin fans what size fans fit 9"?