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So, i'm kinda newbie myself a little, but have something on mind.

First, you could be facing common color profile problem. Meaning that PS can show color diferent than explorer (or what you are using to get those samples). To understand is that your real problem you should save that your's new (colored) image and try to view it by your web browser. If it show diferent than PS then you have to "equal" what PS and browsers shows. Personaly i use in PS rgb: sRGB IEC6.... or Adobe RGB (1998) settings are under Edit/Color Settings.

Second, by experementing with exist swatches found that to get closest to origanal color with using overley "grey" should be about 60% grey or RGB (128, 128, 128). So make "base" color to those numbers and see if you get what you want.