Frizzy ends when straightening

I alternate wearing my hair naturally curly and then straighten every other time I wash (I wash twice week).   I don't use shampoo and use 100% pure argon oil.  However when I do the straightening with a blow dryer with round brush attachment the ends still get frizzy.   I already cut off about an inch.   Opinions if I should keep trimming the ends down - my hair weighs down better with more length, unfortunately, I would love a shorter cut but every time I cut it a few inches below my shoulders I get that "pyramid" look  that is not pleasant.

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