As a mid-tier Cybertech (250ish) I can say that I am having no prolbems selling anything I put up. I've got a slew of mid-tier (15-25) purple armor mods that sell as I put them up. I've got blue mods/armor mods from 9 - 27 that sell as I put them up. I've had ship upgrades (grade two) that sold as I put them up (minnd you, right now I've gotten out of the ship mod business temporarily, as the market is glutted atm).
The key is searching for the shortages, and filling the holes --- not just mindlessly crafting and putting things up when there is already a ready supply.
Of course, as has been mentioned --- this is server/economy specific. Different servers' economies are going to behave differently. It is still a new economy, and any economy in any MMO ever made will experience instability in the first 2-3 months...and then, every server within an MMO will have its own unique economy that looks completely unlike most other servers within the same game.
Give it some time to settle....and I am sure Bioware will be making adjustments as well.