Hi,
it sounds strange to me as I did similar real-time IB and MBT quotes comparison and I found out that spreads in MTB are smaller(=better) then in IB.
Ca 70-80% of time of my tests spreads in MBT ware smaller then in IB, for example:
for EUR/USD about 0.1 - 0.5 pip,
for EUR/JPY about...