* increase max post-scaled amount to 10^34

* tighten tests around max pool assets

* change big.int to sdk int pow

Co-authored-by: Dev Ojha <ValarDragon@users.noreply.github.com>

* fix power calculation and clean up comments

* minor comment cleanup

Co-authored-by: Dev Ojha <ValarDragon@users.noreply.github.com>