I researched IBFX before too. They don't have a dealing desk, their clearing bank is shared by 3 other brokers. The clearing bank has a dealing desk. I have heard unconfirmed reports from a source with poor reputation that there is a nasty character who runs the clearing bank/dealing desk for several companies. I have confirmed from good sources (financial reports) that all three brokers are using the same clearing house. I can provide links if people are very interested.

Can I get the date of this 'spike' ?

I don't plan to use any broker with spreads once my trades are over 5 lots. I might switch sooner, but that honestly means no MetaQuotes.