I bolted on a couple jet engines during descent of my eve lander and they worked just fine, fired up to 100% efficiency. That should simplify our return trip a bit, land on eve with a space plane then when you want leave again use the jet engines to leave the thicker part of the atmosphere using barely any fuel and then complete the orbital insertion with some regular rockets. It would be a huge space plane to include the engines and fuel to make the trip back home again so maybe a rendezvous with a nuclear powered ship in an eve parking orbit would be most practicle. Anyway, this should open up a few options