Atlas tower suggestion area scaling

This is just a random thought I had but I think it actually enhances gameplay.

The area of effect of the towers should scale based on thee difficulty of the map that was used to complete them obviously the numbers should be played with but something like this seems like a good idea to me what's everyone's thoughts?

Map tier | area
1 | -10%
2 | -5%
3 | 0% <-- current size
4 | +1%
5 | +2%
6 | +4%
7 | +6%
8 | +8%
9 | +10%
10 | +13%
11 | +15%
12 | +16%
13 | +17%
14 | +17%
15 | +20%
16 | +25%