I am enoying this very much
I think you're going to have to choose quickly.
Either choose to invest in researching and then building grav survey ships, in hope of finding something good very close by, OR terraforming. Either of them is not cheap to research.
Terraforming I think would take... too much time. You'd need to build a lot of huge orbital stations, in order to have an enormous amount of terraforming modules. Else it would be too slow, and I really don't think you could build terraforming ships. At any rate, if you want to go down the terraforming path, you need to do so very soon and decisively, in my opinion
The fact that you still have to convert a part of your industry does not help there.
I'm really loking forward to see what happens