To: uss ducky
Actually not quality, but the bitrate influences output file size: the more bitrate, the larger output file size.
Please could you attach a screenshot showing your input and output file parameters: add the source file into the program, choose the preset, then click on Advanced > File Information and make a screenshot of this window.
It would be also great if you sent a part of your input file, as the problem might be that the input bitrate was recognized not correctly (too high) and, as a result, the output bitrate was set much higher in the program than it should be. Please check up the support page for more information on how to upload the file.
Thank you in advance