Mr Hat,
The COBHAM figures you provide distort the case a little for the following reasons.
All the figures are 4 yrs old and have to be adjusted by 4 x CPI increases.
Quoting the year one figures for an F/O works OK. I'm not sure what the last 4 yrs of CPI's are, but as an example if they were all 3% then F/O starts at $70k. Nno one starts as a Captain in year one. I don't think anyone is actually on less that year 4 as a Captain, so that's $144,000 until June at which time it increases again, probably about $138,000 if you make Captain in 3 yrs.
So it depends on whether you want to paint a worst case scenario or what people can realistically expect. Problematic!