That's a great system. I use it, too, so, of course, I would think it's great. Hahaha
One thing I'd add is to use a lure that's similar to what you've made, one that works, in a side by side float test, so you can get your lure to sit like one that already works.
I'm talking more about type of lure, like shallow runner, mid range/deep runner, top water, one with a similar bill angle, and not so much a close match to the actual lure you've made.
I've found the attack angle, the angle the lure sits at rest, is critical in how well the lure dives, and how well it lure performs, but I don't know enough to say what it should be for each type of lure, so having something to imitate helps me a lot.