@Joy hiking boot fit can definitely be tricky, and so personalized. I also have narrow feet, so I'll share 2 things that have worked for me, recognizing they may or may not work for you:

• Even though I have slightly flatter feet, I always wear Superfeet (pink specifically) in my hiking shoes and boots, as I find they hold my arches up a little and therefore help lock my heel in the heel cup, thus minimizing my foot sliding forward on the downhill (and keeping my toes away from the front of the shoe/boot)
• I currently wear the Salomon Speedcross for day hiking, or shorter backpacks with less weight, and the Oboz Bridger for longer/heavier backpack trips, both with insoles

Hope this helps!