How strict is the FHA Self Sufficiency test?

[Ben Hunt]

I'm looking at buying in an off market 4-Plex in Austin Texas using FHA financing where passing the self sufficiency test is iffy.

In my calculations, 75% of the total rent covers approximately 100% of the PITI. However, there is not much room for deviation here.
If the appraiser finds that the fair market rent is a bit less and the calculation then shows that 75% of the total rent covers 95% or 90% of the entire mortgage, is the whole financing deal a no-go?

Does the underwriter take into account my income or credit history as a factor for leniency on this rule?

Thanks and let me know,

Ben