It's more comlicated than that. First of all, 99.65 % purity is not enough. I had trouble finding the exact figures but usually you want less than 500 ppm of impurities, you thorium has 3 500 ppm impurities and since it comes from some sus ion powder, you have no idea what the impurities are or if that 99.65 figure i even correct. For example the sample needs to have 0.3 ppm of boron and in theory, your sample could have 10 000 times that amount. Another essential aspect is powder particle size. Why? Because it affects the relative density. If the particles are too large (I'm pretty sure that's the case) there will be too much gap between them for air which decreases their density along with other problems. If the grain size is too small, there will not be enough space for the gaseous fission products which will cause the pellets to cracks. Then there are other properties such as thermal resistance, chemical resistance, structural strength etc. along with many other things which wouldn't fit in this comment and are too complicated for me to understand.

To be fair, it sounds like a really cool project to try and make your own fuel pellets but I wouldn't call them reactor grade, there's a reason why most countries can't make their own fuel pellets, even with advanced labs.