I graduated from King's and stayed at GDSA in my first year.
When I was there, everyone at the other accommodations wanted to be at GDSA, as it was the most social with parties etc. It was so so much fun! No one I met at GDSA wanted to change once they had settled in, apart from a couple of people who wanted a much quieter and less social accommodation.
Just thought i'd mention as it's something to think about! However, I understand why you want to swap as the rooms are small. The other accommodations are also social though ofc.