Gts are not used to make any hybrids. They are unable to hybridize outside of genus being South American cichlids, same for chocolates.
Carpintis are likely used to make bright Texas, as they are a bright blue fish.
Carpintis would be a good option for a partner because the two are closely related and the carpintis would bring lots of blues in the offspring. Essentially an unfaded red Texas.
Aquatic Aggression
makes a good point that by breeding with anything that has Midas genes, you aren’t really doing anything for color as all of the color genes were already passed on.
BTW your green terror is amazing! And the Texas looks like it is going to become a stunner too! Takes a bit for colors to come in all the way.