Horseshoe goals unrealistic

I'm in a neighbourhood of only 2 people. In the derby I checked we are playing against other teams of also only 2 people.

Our horseshoe goals are as follows :
1) 400
2) 800
3) 1300
4) 2300
5) 4100


Now if we both do all 5 tasks at 320 (which seems is the highest points tasks), we each will only get to 1600 points, thats 3200 total at the end when all 5 tasks are completed.

How are we ever supposed to get to 4100 points and higher to unlock the other horseshoes without having to spend diamonds to get extra tasks?? It seems unfair because we left another neighbourhood because the members only played points between 80 - 150, but even then we managed to get all 5 horseshoes, and sometimes even go higher than that..