hey jonny
seems alright... it just means that on average you have a 0.29:0.71 value:bluff ratio. so it looks like you have ~2.6% value 3betting range and a total 3betting range of ~9% on average. ofc the numbers will be different depending on your opponents and how you adjust to them.
i don't think anyone could tell you what a solid stat would look like. instead it's more about each different situation and if you are making a profitable decision. so if the most profitable decision for you is to 3bet bluff someone ~6.4% then just keep doing it. 71% 3bet/fold is high, but it doesn't mean it isn't profitable if you are choosing your opponents properly. i can't speak for nl50+ when i say this, but i think most players will have a similar looking stat.
p.s. moved your thread to the NL section