Ok, for me it is quite the opposite. I had to go custom because I find the head tube lengths way to small, and I could basically just use the tallest endurance frames (Canyon Endurance CF7, Specialized Roubaix, etc) comfortably. With the tallest chinese ones I have to use like 5cm spacers under my stem, otherwise the saddle-to-handlebar drop quickly goes over 10cm and it is too damn uncomfortable for long routes. My custom has a top tube of 54 cm, but then 175mm head tube and 600mm stack.
175cm tall here, but with 86cm inseam.