Boost converter probably wants a specialty flow. You can only
boost as high as your switch device breakdown, less the forward
diode.
For simplicity's sake I might suggest you look to the cheap
hysteretic style boost chips from outfits like ON Semi, Diodes
Inc and so on. But whether you can implement any of them
in the flow you're made to use, is for you to assess.
Hysteretic is not PWM, but PFM. They are pretty unconditionally
stable unlike linear PWM control loops.
At this geometry you ought to seriously consider a digital
engine. Still need a reference and a comparator, and a clock
resource. But the rest of it might be better off done with
a counter instead of a ramp generator, an accumulator
instead of an integrator, and so on. That's a hot topic right
now.