If it's the Biters you are afraid of in the first picture then use following settings:
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Set the enemy base size to Medium or at most at Big. Otherwise the generated nests will be quite close and just one huge wall, lasting for many, many chunks, sometimes even endless.
Setting the enemy bases to Very low and the size to very big is much more difficult to survive than setting both Frequency and Size to Very Big, it's something I experienced in the past quite often. But playing with settings where Enemy Bases are huge and/or very frequent is something only recommended for advanced/experienced players anyways because you will have a hard time playing when every 20-30 seconds huge swarms of biters chew on your turrets/walls and at some point you might even have to give up on the map because you weren't progressing fast enough and can't kill the evolved biter nests you'd need to kill in order to do more research or because you run out of space to build with no chance of killing the nests to make more room. Or you will run out of resources and the next patch is so far away that you'd have to slaughter hordes of biters which leads to the same problem.
Also a tip:
If I have to recommend something... use the map editor to check on some Map Seeds to find some you like and check out the neighbourhood there, because there you can scroll and look what the map with the settings and the seed will look like. It might take away the surprise a bit, but you will also avoid getting dumb maps.
The look of the landscape (distribution of water/land/biomes) is only influenced by
Terrain Segmentation,
Water and
Starting Area. If you enter a specific
Map Seed combined with a specific setting from the 3 options mentioned the map will always look the same.
The resource settings (Iron, Copper, Stone, Coal, Oil, Enemies) are independent from the other settings above and you can play around with them without changing the look of the landscape, so you can adjust the resource settings and regenerate the map until you find something that suits you.
I play with similar settings like you want...
Terrain Segmentation: Normal
Water: Medium
Iron/Copper/Stone/Coal/Oil: Very Low, Very Big, Regular
Enemy Bases: Very High, Very Big, Regular
Starting Area: Very Big
Map Seed: 10
With the difference that due to my experience I set the Enemy base frequency to a maximum as well as their size and it's real nightmare. I used the map seed 10, but with very low/very big Iron/copper Ore they are really spaced very far from each other in the beginning, which took me hours in the start to overcome, but I'm glad that I did because I like that map seed otherwise. When adjusting the resource settings there are settings where the resources are much closer to each others, but you will have to fiddle around a bit in the map editor to find something suitable.