You might start by figuring the inductor's maximum
"charge" (volt-seconds when "on") and what that "slug"
should deliver for current to the load, as total charge.
Then you can multiply that by chop frequency and see
how much current can be delivered.
Your on time is the charge and the chop rate makes that
the current.
You might have too short a dwell time. You might have
too small an inductor and be saturating it, wasting much
current and stressing power devices. You might have too
slow a chop rate. And of course the charge and the
discharge should both fit into a cycle (DCM) if that is
the control style, though CCM will throw more current.
Be aware that boost converters really suffer for efficiency
at high boost ratios, and a flyback might be a better
choice if you expect always a similar boost ratio. The
transformer ratio can also put you more toward a 50%
center duty cycle vs line / load / make / temp. I'd bet that
you can find plenty of well modeled, suitable core capacity
flyback xfmrs at distributors, and guidance on selection
at major vendors.