Amending data files

[Growltigger]

Help. I know I have asked this before but please help.

When I play SEIVG, I play single player with TDM modpack as standard.

I want to do three things.

1 decrease the speed at which all shipyards and planet based shipyards build;

2 increase the cargo space occupied by 1 million people (I hate ships nominally lugging 250 million people round the map - yeah right, the whole population of the US in one spaceship I should cocoa); and

3 decrease the rate at which planetary populations reproduce.

I had thought that 1 and 2 would be a simple case of tweaking the relevant settings in the data file.

But, I go into my Shrapnel Games program file, into SEIVG and the TDM Modpack, change the data settings, say yes when it asks me if I want to save, BUT it does not pick up and make the amendments in the game!!

What the buggery am I doing wrong? and how do I sort out item 3 above?