I've been working on migrating 40+ sites to mysqli and Mags (MWilson) help is great.
I have migrated 5 sites today.
What I can share:
1) Use server behaviors not the bindings record set (which I thought it should be)
2) In server behaviors, do the "insert" or "delete" etc before doing main record
Also check your current mysqli files to be sure latest.
rsjobj version 2.55
queryobj version 2.34
Hope this helps.