For flattening the boost curve, do you suggest raising ldrxn at the lower end to bring requested boost up?
Yes, or twiddle with the KFURL path (load->boost) to make req boost flat with respect to req load.
In any case, cleaning up IMAX is way more important I think..
I'm also thinking that holding a bit more boost mid to upper range is possible, near the top the injectors are close to maxing out so I'm fine with dropping down to around 10 psi in the 6000 rpm range, but it seems like that middle upper area could support a little more boost.
I have yet to overlay your data with the compressor map, so I'd hate to make a guess at this point...