Scaling tech and production costs

[NapoleonBlownApart]

Been putting together a rather large mod for the past 2 years and my work has slowed down since attempting to work out the finer details and get the mod feeling finished. One of the main issues is I have no idea how to set proper costs for techs, units, and buildings. My mod involves a lot of additional techs and units which have lengthened the game experience for authenticity purposes. Now I am running into the problem of techs and units costing too little as time goes on in the game.

Aside from spending countless hours just playing your mod, checking actual tech and production costs throughout the game, and then making complete guesswork out of adjusting costs in the editor... is there any easier way to make sure your tech and production costs scale properly?