Tn Portrait Mode "Fix/Adjustment"

[Dmac122383]

I have 3 ASUS VH236h monitors that I usually run in landscape mode but some games I like it in portrait mode. The only problem with them being in portrait mode is the viewing angle and the gamma change. I usually just sit to the right of the monitors and look towards the left and the screens look fine. Is there any type of tweaks or anything I can adjust to remedy this? I've read that sometimes adjusting microsofts cleartype will help it out some, but havent found much other info on this issue.

I know IPS panels are the best for portrait mode but I purchased my monitors a while ago and they were very inexpensive.

So any tips would be great.

Thanks.