I'm just curious, what objective test have you used to determine that your collapsible tube dobsonian has inferior optics?
What exactly is it that you are hoping to gain by switching to a 'premium' set of optics for this scope?
You may wish to read this...or not; at the end of the day, it's your money (assuming you are purchasing the primary, secondary & will spend money somehow extending the length) but, I suspect you will likely not actually observe any discernible change in the views...
https://www.lcas-astronomy.org/artic...tegory=general
Unless of course, you have objectively measured that your primary just isn't up to scratch, in which case, I would be returning it from whence it came & seeking a refund or replacement... you might just be surprised how good those Chinese 'mass produced' optics actually are (and some of them are actually exceptional)..
My 2 cents...