How can I get rid of dry spots in my hair?

I have thick, coarse, 3b hair that will not absorb anything in like 3 different spots (top front and each side in front of ears). I tried adding more product to those spots (results in white specks in hair) , adding oils, and I do a deep treatment every week! Is there anything else I can try? Thanks in advance!
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Answers
2B/2C, fine hair, low density, mixed porosity, protein loving hair
Current products: