Not really one for posting or speculating, but have been more or less following this thread and have been involved in fluid control engineering for several years in my previous occupation.
I would say that given the latest report available that maybe we are all looking at the wrong end of the fuel starvation chain. I am sure that the AAIB are also checking this but it would fit with the known facts that it could possibly be a problem with the venting system to the tanks, if it were the case that ice or other foreign matter were to clog the vents to the tanks then this would give a similar situation to the engines being able to produce thrust at low EPR and when commanded to increase thrust, then the vacuum effect would not allow sufficient fuel flow to the engines and associated pumps, resulting in an initial spool up followed by a reduction in thrust and thus causing the pumps to cavitate, just my 2pīs worth but it figures in my head.