"a few deviations" is correct and usable in written English.
You can use it to describe a few changes from the normal or typical way of doing something. For example: "There were a few deviations from the report's original design, but overall it was very successful."
"It looks straight as an arrow, perfect pavement, absolutely west-east with a few deviations through villages for time checks.
The test parameters are similar for all three procedures with only a few deviations, e.g. different L/A ratios (see Table 1).
However, in the course of incorporating the principles of Socialist realism, there were quite a few deviations introduced by the communists.
Its properties should generally match those expected for a heavier homologue of osmium, with a few deviations arising from relativistic effects.
While his debut LP, Glow, features a few deviations from the his typical summery house sound, "See Right Through," Tensnake's heavenly collaboration with vocalist Fiora, finds the artist in a space he's most comfortable.
Her vocal range spans over an octave, from the low-key of G to the high-note of D. The song's primary chord progression is Cm A-G (vi-IV-III), with a few deviations.
But, as they would say here, Mr. Draper's politics are a few standard deviations from the mean.
Nonetheless, a few specific deviations from fully informed rationality have been explored.
According to some sane, smart people, now showing up a few standard deviations out on the curve is the possibility of humanity's demise.
New Keynesian models are intertemporal maximization modified with sticky prices and a few other deviations (such as balance-sheet constraints).
You can walk carefully in the footsteps of moderation and responsibility, staying within a few standard deviations of the conventional wisdom, or you can wave the bright flag of opposition.
