Don't scale up the low poly, you juse need to affect the cage, Isaiah. Just need to affect the cage. You see the black edge errors on the edges of your low poly, right? Read this tutorial, see if it helps. https://marmoset.co/posts/toolbag-baking-tutorial/
The UVs aren't optimized quite yet. This tutorial might help clarify some things with the UVs but definitely create as few shells/islands/groups as possible. You should easily be able to only have a handful of UV shells with this simple of a model.
Nicely done. It doesn't make sense for all models, but for simple things like this I like to build the low-poly game topology first. I don't bother getting the right forms or anything, just the topology I want. Then I take it to Zbrush and use the superior move brushes in that app to start working on the silhouette, and…