G1-150-166 are on a stronger transponder, 167 and up are on a weaker transponder, a VCII+ board has no effect on the digital side, this sounds like a alignment issue or the feed not being centered, what lnb's do you have, what is the stability, I would not get anything without a LO stablity of 250khz or atleast 500khz the lower the better, is there anything in the line of site of the reflector? trees, brances or houses, this can cause problems, it is normal that sometimes a lower cost lnb will perform better on a cooler night or on a cold day, and not work good on another day.
If your dish is smaller than 8.5' then you are experiencing adjacent satellite interference caused by 2 degree satellite spacing, if your dish is larger than 8.5' and there is nothing in the way then it is the feed being off or the dish is off, a tech with a spectrum analyzer is recommended.
With the low readings you are getting on Starz, I do not see you locking any of the HBO/MAX feeds on Galaxy-1R.
If the dish is working on other birds, and digital and analog are coming in then the 4dtv is not at fault, there is a fault at the receive site, and a good tech with the proper tools should be able to resolve the issue for you, or you can do it yourself great info can be found here:
http/www.geo-orbit.org/sizepgs/tuningp2.html
Though a tech with a spectrum analyzer would be your best bet.
Good Luck.