thus when you have fractional reserve and rates are dropped so low
Artificially low interest rates have absolutely nothing to do with fractional reserve banking.
You sure about that? Your calling it artificial for a reason... should the system been either incentivesized so that actors didnt act so irrational or the system was not fractional to prevent ability for actors to act irrational for selfish reasons in the first place then we may have not had to drop rates for so long to spur economic confidence.
The way that fractional reserve banking works is that government borrowing must be at a lower rate than corporate borrowing which increases pro-cyclicality, crowds out more economically productive private investment and, even as it reduces absolute interest rates for all borrowers, drives rates further below the natural rate.