Getting rolled by higher GP guilds is just a symptom of the broken game mode. Don't fix this symptom, fix TW or trash it and restart.
When you have guild members that are spread across the globe it is **bleep** near impossible to coordinate attacks to clear zones. Often we need a few of those members for their counters, yet they are sleeping for another 6 hours. The entire guild needs to wait, then when you do clear the zone, the next set of members are away. The coordination is impossible. The entire TW game mode doesn't function well.
Our 500m guild does TW for rewards (win or lose). Winning happens about 1/3rd of the time. It is just how it is. We are over any sort of emotion for winning or losing, and competitiveness is not there. It is just this broken side game mode to get a few rewards.