It's common when people submit runs where most of the input has been copied from another player's TAS to submit it with the author name "(you) & (old TAS player)". In this case it means that the author name in the submission comments should be changed to "AndiHoffi & Randil's Solstice ... ". Personally I don't really mind, though in a way it would be reasonable to keep me as co-author if all but a few frames of the input is mine.
Oh, and by the way, nice TAS. :)
While looking through your TAS, I've tried to spot further improvements. I found a 2 frame improvement in room 197 (around frame 8151), by jumping on the spikes here. Unfortunately, I got a 1 frame longer loading time in a subsequent room, but I still squeezed out 1 frame!
http://dehacked.2y.net/microstorage.php/info/4829715/hoffi-solstice_imp_v1.fm2
I'll revise the run a few more times, maybe I can find more improvements.