What I believe is high-end finders help you finding RARE ores, not helping you find more ores/bigger sizes.
I am not in any way your level, comparing to using tk-320, but I've been using OF-105, tk-120 and later tk-220. Never hit any tower or something, tbh, the biggest finds I had was on my oldie OF-105
I believe with tk-320 AND the right spot you're able to see the swirls on more rare ore than it'd be with any lower-depth finder.