Thanks for the all the helpful input and apologies for late reply
I have been trying to profile Felix Schoeller 'True Fibre 200gsm'.
This is a fairly lightweight alpha-cellulose paper, similar in weight and thickness to Epson Watercolour Radiant White (but unlike WCRW is smooth with a 'natural' white point)
Struggling with persistent cockling or buckling in areas of heavy ink load.
My studio Relative Humidity is usually around 55 to 60%, so I don't think that is major factor?
Yes, thank you for reminding me, of course, always important to get all settings like media type and density and feed decided first, then create profile (reducing density after profiling, on a print-by-print basis will reduce saturation/gamut)
Tried a lot of media types trying to get the ink load right. Working downwards from VFA, Enhanced Matt, WCRW, DoubleWeight, SingleWeight etc etc
Reducing the 'ink density' setting on any of the media types appears to reduce saturation and gamut (based on just looking with the naked eye, haven't actually measured tests with my i1Pro) but my understanding is that the profiling process would correct most of the loss of saturation and gamut?
After a lot of tests and experiments what I have found is that suction ('vacuum') and drying time also make a big difference on lightweight papers. Lowering the suction (in the platen gap area) helps a lot. My guess is that, with a lightweight paper, having a strong suction causes the paper to buckle at the moment the ink hits the paper and saturates it. Also adding a significant amount of drying time (head pause at the end of each pass) helps - but obviously makes for a slow print.
I have currently settled on Enhanced Matt media type with -5% density, +15 drying time and suction at -3(52%)
Thanks again for all the replies and input