Sometimes the actual mileage credited to your account is different than the one written in the mileage calculator of CO.
For example - TLV-EWR is 5666 miles in the calculator, 5692 in the account.
I suggest you to check the actual mileage and recalculate.
You can always break one of the direct LAX-LHR in EWR or IAH to gain some more miles (you can fly VS to EWR).