To clarify if this is trophy related you need to analyze your reports. If you are getting defeated and are losing a lot of trophies - you’re being farmed. If you are winning with a small map progression (~10%) and are gaining trophies - you’re having trophies dumped on you. With the way the game calculates trophies it’s pretty complicated but you could either drop your trophies real low (like to about half of what you have now), or quickly gain a lot of trophies - when you challenge players ~1000 trophies higher than you, you get 0 trophies, for reasons know only to flare. You two are fairly close in trophies so either scenario fits.
It may also be about medals, and they have found an easy enough source to do well in leagues. But this depends if they are winning or not.
About opening your base though (removing towers etc), it won’t stop them from getting trophies, it will stop their experience gain, if that’s what they’re after. As for everything else, an open base will make things easier, as you don’t have to work for it. So if he’s after your trophies, a defenseless base will get him to his goal quicker. Or maybe will get bored with lack of challenge, I dunno.
Can’t really say what this is about, besides that they’re persistent. I wouldn’t bear hitting the same map 70 times in two days. It’s boring enough to hit the same player two-three times a day in wars, let alone 30 times. Some people clearly have too much free time.