For (4,s)-Salem point sets P in F_q^d with |P| much smaller than q to the power d over 4s, the deviation of point-sphere incidences from the average is bounded by q to the d/4 times |P| to the 1-s times |S| to the 3/4.
Lewko,Finite field restriction estimates based on Kakeya maximal operator estimates, Journal of the European Mathematical Society21(12) (2019), 3649–3707
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A sharp point-sphere incidence bound for $(u, s)$-Salem sets
For (4,s)-Salem point sets P in F_q^d with |P| much smaller than q to the power d over 4s, the deviation of point-sphere incidences from the average is bounded by q to the d/4 times |P| to the 1-s times |S| to the 3/4.