I did the same thing when I started roasting. Tried to learn with small batches so as not to waste precious beans. Unfortunately (as has already been suggested) it doesn't work that way. With the HUKY it really needed 350-380 grams to work well. I don't know what the 'sweet spot' is with your Buckeye, but it would be easier for you to drive her with an appropriate load. Conventional wisdom (whatever that is) suggests about 3/4 of what the roaster is rated for, which is why the HUKY 500 does her best at about 350-380. Once you have mastered that size charge weight you can probably adjust what you have learned to roast smaller (or larger) batches if you still want to, but for learning? .... you are wasting precious time -- and beans.
Also wasteful is buying beans that you don't really want to drink. As the old saying goes, 'you can't make a silk purse out of a sow's ear'. Buy good beans.....not the most expensive, but reliably good....or you won't know if your roasts have succeeded or not.
Yup....it's gonna cost some money to learn.
Yup....it's gonna be worth it when you do.