That will be a very top heavy blade if you choose T05 or T64 for both the forehand and the backhand. T64 is faster than T05 and pushes shorter than T05 meaning it is less sensitive to service spin. T05 has more control than T64 and if you like to attack the service then I find it better for the backhand. It all depends on your technique. If you use a European style you probably want T05 on both sides, but if you have a more Asian style T05 FH and T64 BH is a popular choice. If you have a Chinese style I'd recommend a Chinese Rubber on the FH like H3 Neo or Skyline 3 Neo. I also like the 729-5 or 729 SST God Favored (blue sponge) as a FH rubber. Then for the BH you could use T05 or T64 depending on how much you enjoy using your BH. If you prefer to get into BH rallies and have a strong loop T64 is better, but if you enjoy your backhand but do not have a strong loop T05 is better suited.
If the setup is head heavy with Tenergy on both sides it will be more top heavy with H3 or Skyline on one side and Tenergy on the other since those Chinese rubbers weigh more than Tenergy. But there is nothing wrong with head heavy and there are a lot of people out there who use Tenergy on both sides with a Timo Boll Spirit or an ALC or any number of other comparable blades. Dan uses TBS with Tenergy on both sides. Everyone I know who uses a combination like that, and I know a few, really likes it. And I think the H3 NEO or Skyline NEO on the forehand with Tenergy 05 or 64 on the backhand would be a great combination as well. You can look at my set up in my signature.
I am using a blade that weighs the about the same as TBS and I have used Tenergy on both sides (64, 05). I have also used Skyline on my forehand and now am using H3 NEO. All those combinations have been good.
In the end it really comes down to personal preference. When you are a good player you adjust to the equipment you have as long as it is good equipment. And over time you find what will be best for your own game and technique.