The run lines in the form could be in part from sand washing into the mold, but that would be noticed in the breakout if the sand was still present. Check out reducing vs. oxidizing flames as once the metal is molten it becomes another animal and really sucks when it can . If there was any dross or impurities in the pouring the rough surface of the metal could also be caused by that. Now for a fix. I do not find the surface to be objectionable in form, just in a disappointment of the ultimate casting goals.
Lets face it.
If one wants perfection and is able to attain it if follows that one moves on to other degrees of accomplishment. You have a very nice set of forms, had to be fun, hope you like them alot but do feel free to like them even more and get open to them. So please do not be offended if this strikes you odd, but I really am thankful you sent the JPG's and hope this may also help to spur you on to even more fine accomplishments and realizations. Hey, it's a rose garden out here.