Actually, there is a huge damage reduction on solo debuffs, as stated by the response from the bioware employee. Prior to the 1.2c patch, I was critting 6.5k with HSM on TEST dummies and 7.5k fully buffed. Now I'm only doing 4500-5000 on the same test dummy. My dps over five minutes was reduced from around 1900 to 1500. There was a huge nerf because I did 4500-5000 PRE 1.2 and since then, I've gotten upgrades and have over 2130+ AIM 40% crit 300 power now with over 100 more aim(due to augments).
I'm using the parser damage meter, so math isn't really required, it just tells me the overall damage and of each skill, etc.