mbp and cir

Every 1 cent that MBP goes up has 1.2 cents impact to CIR. In the last three weeks, MBP has increased by 70 cents yet CIR has only increased by 22 cents

I got myself set in CIR yesterday (I hold MBP too) as there looks to be more upside and less risk in CIR.

There doesn't seem to be many others doing this so I'd appreciate it if someone could poiint out any flaws in my logic here