For us no speaky 'strane lingo mate, perhaps Framer could translate his simple fix.
As regards the original question I find some of our aircraft are noticeably worse at holding selected speed in all regimes. As the FMS software and flight planning are otherwise consistent this makes me wonder if there could be other factors at work. Performance of older aircraft is known to deteriorate in areas such as fuel burn. It is not beyond the bounds of possibility that there could be an aircraft specific factor at work.