Not mentioned yet;
Disconnect yourself from the property and land by moving the title deeds to a foundation or trust and “rent” your own property so to say.
Also consider using the (partial) use of parent - subsidiary directive by having for instance a Cyprus company taking a little share in your Spanish company. This opens up a dividend route and eases the way for the use of IP route.
Appoint (not just in name) a director in Spain and you have distanced yourself a little bit further from the Spanish based activity and will be able to employ Spanish workers.
And move. Not just︀ on paper but in all senses and limit your visit to Spain to below tax︁ threshold days. Make sure to stay in hotels even. Do everything to sever the ties.︂ Spain is, as you said, the worst country in Europe when it comes to taxing︃ citizens (and residents sometimes as well)