Iphone link placement

I’ve got your plugin installed on my site http://www.yambahummus.com. I’m struggling to get the offset right. My client is super focused on mobile, so tho the desktop version isn’t perfect terms of where the navigation jumps to, on ipad it’s great. Each section that the nav links to jumps to the top, title showing. Somehow on iphone no matter how i set it (anywhere from 85 to 120) it always jumps to same place. There’s a good 1/4 of the screen taken up by the content above it. How can i get it right on ipnone?

https://ww.wp.xz.cn/plugins/easy-smooth-scroll-links/