Buck Converter - Closed Loop - Effect of decreasing inductance and increasing capacitance
These are just a few short comments.

This data is just load regulation error.  

Your voltage error vs current is mainly due to resistance ratio of series R to load R.  The series R includes inductor DCR, switch Ron   and/or Diode Rs.

When you use such a large L in your test, realize the step load from 100% to 50% causes a great step load voltage error V=LdI/dt and one in the 1 ~ 100uH range.  But a change from 2.2 to 1mH is not so significant.  This also means the start time is long. the XL(f)/R= Tau time for start time. 

Also a large C reduces ripple but a large step Response time Tau=RC just delays the time for a voltage error with such a large C.  

So now you know reactance has little effect on steady-state load regulation error.  It's the series R of those reactors.