Ok, thanks, i wait for your results first.
@ David@ Emrol
The correct settings to achieve 1Mbits can be found here:
http://www.ghielectronics.com/docs/38/g120hdr-developer#344
Please let us know how this works for you.
Office is already closed over here but I have this tested first thing in the morning 
So basically you keep the same clock but use half the ticks to process a bit, witch off course would be the same result as doubling the clock…
Well, first tests confirm this is working, more testing will be done next week 
A test has been running all day without errors so I believe this setting is reliable, thanks for the support!
Maybe pass this to Jeff to correct :
Link has been updated.