Thanks a lot for the reply guys. I decided to go with IP 5400 60C lipo, I think I don't need very big capacity that 31mm tall lipo offers since I only do a 8 min every run. And the IP weight about 280g, so with the ballast weight it would be about 367g and it's close to the battery weight recommendation on the lipo standard setup, which is 375g. Any thoughts about this?

And for the shock cap, is it better to use the aluminum for durability?

Thanks