The website I linked in OP is not active. The guy who started it last year on Reddit has moved to SBNation and is posting weekly updates there and on Reddit.
Yes, it is hard to scheme to grab land, because most of it is out of your control, from the size of it to whether your opponent has any of it when you play them. TCU lost to tOSU and has no land for us to gain, but they can get ours.
The only thing I can think of for maximizing land is to be the first tough team your opponent plays. Let's see our schedule with this in mind.
1. Maryland: Hmm, let's move on.
2. Tulsa: We were their first tough opponent. We got their land.
3. USC: Stanford was there earlier to take it away
4. TCU: tOSU took it away
5. KSU: MSU took it away and if they beat WVU (very unlikely), then we'll have the opportunity to take it from them. So, not much of a chance
6. OU: They will come in undefeated and we'll have a chance to add to our tornado alley, and Hawaii! (from Army from Hawaii). They didn't/don't get anything from UCLA, ISU and Baylor because they lost prior to playing them.
7. Baylor: Nothing to gain
8. OSU: They could be undefeated when we meet them with TTU this weekend as their main competition. We can gain their land and Houston from TTU, but no west Texas because TTU lost to Ole Miss, which was brutally robbed by Alabama.
9. WVU is ideally setup for us in terms of imperialism, they play all winnable games till the 9th game against us, with 3 difficult ones to close the season (TCU, OSU, OU). Not much to gain besides WVU because of intra-conference fighting.
10. TTU: Not much to gain.
11. ISU: Ditto
12: KU: We go 8-0 in conference and give it all away to Kansas!
So, best case scenario, some Big 12 land; worst case scenario, Rock Chalk Jayhawk.
The map maker also has continuation map from last season as if 2018 is continuation of 2017 season. This is lot more biased towards long winning streaks and hence cleaner.