I am glad you are experimenting for yourself, seeing what works and what doesn't. As long as you have a plan to add ballast. I will say with 99.5% certainty (not exagerating)you will need ballast. I probably made 70-80 baits out of basswood, mahogony, and cedar (all except one -not including my 2 double jounted- swam fine, perhaps not at my intended depth, but not off by much. The one that didnt swim well at all was the one where i did not add ballast)before trying balsa. Since i have tried balsa (perhaps 8-10 baits or so) most, if not all swim shallower than i had intended, and this was an iterative process where i kept adding more wt as i made more baits. Heck, i still have yet to make a single balsa bait that swims as deep as i would like. Some are close like swimming at 2 feet instead of 3, but some are way off. One i made that i intended to be a 5-8 foot diver ended up being either a topwater or subsurface depending on how fast hou reeled. At the same time these balsa lure aremostly bigger lures than i had been making, so my background experience of guestimating how much ballast to add may not have been effective. Due to its low density, balsa is the most "finicky" wood to work with when ot comes to amount of ballast to add (its more than youbwould think, especially the bigger-ie more volume- of balsa wood you have and the deep divers are the hardest baits to make.
Having said that, i can tell the bug has bitten. Pretty soon, you wnt want to fish anything unless you made it. Please dont take this the wrong way. I am always excited to see newbies and you are off to a great start!