I have been testing many of the combinations of custom attributes and I have come up with values I think better represent the true worth of each trait. Growth and money are the dominant traits, but the best two combinations of traits I have come up with so far are +50% production and max growth/food that I could muster. The second best is max morale + max credits. In my universe (large spiral, old, 3 computer players, no pirates, no random events, very hard and seed 19) the growth + production built a doom star with adamantibe armor and ship strength of 557K on turn 155 and the morale/max money build built the same strength doom star on turn 162.

I can't accurately test ultra rich homeworld in a production growth build because UR turns the homeworld into a high gravity planet which is crippling early on. I did a rich homeworld + growth and +50% credits and only achieved a time of 201.

50% research, growth and credits build was 174

50% food, -50% consumption + 50% growth was 169

All others so far have been well over 200 and I do not see anything improving on the growth/production model except maybe a growth production variant with UR homeworld.

I attached a chart with how I would like to see racial attributes set.

For the record the standard races need a lot of work done on them. Only Sakkra and maybe Meklon can hold their own in my opinion.