never mix cyber with low-G, that's suicide.
I have tried feudal + creative in a SP game, usually with Uni, Aqua, Prod+1 also.
but, usually, the creative is not matched well with it, and Prod+2 RichHW is better matched with it instead.
I noticed the game generates a map somewhat based on what you pick for your race.
If you choose Aquatic, you tend to find a few more water based worlds around you, and if you choose Heavy-G you find more of those around you. So, I mixed them.
Uni, Aquatic, Heavy-G, Prod+1
I had 3 of the 5 Heavy-G planets in the game, near me, and 2 were rich, the other Ultra-Rich.
Uni, Aquatic, Prod +1, Cyber, Rich Hw, was one of the best Cybers I could come up with.
I modeled one race after the
Vaadwaur race from Star Trek Voyager. Episode VOY225: Dragon's Teeth.
http://www.startrek.com/database_article/dragons-teeth#user_info_box
They were found underground and technologically 900 years behind the races in their region, yet, still remembered how to get to their subspace corridors to travel vast distances quickly without being seen. They had lots of small out of date ships. I simulated them as follows:
(6) Subterrainean, (5) Transdimential, (4) Stealthy Ships, (4) Warlord, (1) LG Hw ; (-4) -50 pop growth, (-4) feudal, (-2) Ship Defense
Unbalanced, yes. Slow to build, because, of no Uni or Prod+2. Slow to tech, because, of the feudal representing their lack of technology. Slow to grow, because, they just do not have the population to reproduce fast enough to keep pace with everyone else.
Strategy: You have to build alot of cheap low tech destroyers and overwelhm the fleets you find. If you can't beat them, fly off to another planet and try there. If you can weaken a ships engines, you might be able to capture it. Scrap it and gain new technology to help you catch up.
Also, scout everywhere to meet the new racaes in the region, and steal their technology, as your research will be very slow. This is a challanging race, with some nice atributes. It's subterranean feature allows it to catch up and surpass some races on population, but, at -50 Growth.
Its best ships will be small and fast, such as fighters, bombers, frigates and destroyers, because, of the speed bonus of Transdimential (+4 spd in combat) increasing their ship defense (by +20).
Many races chose -20 Ship Defense, but, few have TransD to compensate for this.