Can't Tether after reaching 6GB METROPCS hotspot cap

I need some assistance guys!

I'm currently using the following workaround to enable tethering on my LG Optimus F6 on the MetroPCS network:

http://ift.tt/1KvRr8C

However, the recent net neutrality ruling has turned what initially sounded positive to a problem. While MetroPCS is giving everyone free tethering access on all available plans, they have a 6GB cap on the Unlimited Data plan. That means that once you reach 6GB, you are throttled at 128k. Once you reach this cap, the above workaround stops working.

-First, you get a text stating that you have 10% left of your mobile hotspot left.
-Second, you get a message stating you've used up all of your mobile hotspot and can "top it off" by paying an additional $5.
- Third, your internet speeds slow to a crawl. I tried switching over to a user agent switcher, but the speeds are still slow.

The only way around this is using a VPN, like Hotspot Shield, which will allow you to continue tethering w/the above method. The only downside is the speeds are slower and not consistent, since they are using Iraq servers or something. (Google loads from the United Arab Emirates??)

Does anyone know of a workaround that doesn't require using a VPN? Perhaps another app or method? What I'm trying to accomplish is either of the following:

1. An app that blocks tethering monitoring from the carrier. I heard PDAnet may work, but I've never been able to get it to work with an LG Optimus F6. Has anyone been successful in getting this to work?
2. Another method to tether that doesn't throttle after reaching the 6GB cap.

ADDITIONAL INFORMATION: I'm currently using Linux. Linux natively did not require that I use a user agent switcher or a VPN; I've been tethering for months using Linux and the method in the above link without VPNs or a user agent switcher. I keep my usage to a decent amount monthly, and I'd like to continue tethering if possible.

Thanks for anyone willing to answer my question and assist.

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Can't Tether after reaching 6GB METROPCS hotspot cap