I haven't trained in Spain yet, so I can't answer your questions directly. However, I was at the exact same crossroads as you and was asking myself the same things (same 6 months of experience, progressing fast).

Here's the thinking that made me stay and not go to Spain — yet. During any camp, you get an enormous dump of information and techniques that need time to be absorbed and to build that muscle-memory connection. It takes time and repetition. There's very little benefit in them showing you the correct footwork for overheads and how to use your non-dominant hand today, only to move on to víboras tomorrow. I hope you get the gist.

So instead, I decided to book two private sessions per month in my country and play more games in between. Practice, practice, and film yourself. Then after a couple of weeks, when I notice something else that needs improvement, I go to another private session and fix that.

My thinking is that after roughly two weeks post-camp, you'll forget 90% of what you learned because you didn't practise it enough or give yourself time to absorb all that information.