I recently downloaded home up for good lock and tried out the bigger app grid sizes, like 6x7, but after I changed it to those, I noticed the apps seem too close to each other. Although how many apps can be put on the screen was technically increased, it still doesn't look right.
I did find this other good lock app called "theme park" that was able to change the shapes of those apps, but not the sizes, so I suggest adding a feature to that app which allows you to change the size of those apps, and I think that making the apps smaller would make the 6x7 grid size look a lot better.
