Here's my basis: http://pd2skills.com/#/v3/mrSnLhIJfGcDa:eIEDa:ggCda:feGCa:ibcea:pR8::w34-27-6-30-13-33:s18-14-35-12-39-29:a1
As you can see 38 points still remain that you can use as you want. I usually use 2 builds that are similar which i simply call l1 and l2
Deagle and M308 have similar behaviour so you can switch between them when you run low on ammo on either one.
as you can see i sacrificed some useful skills to get silent killer and the professional (acing it is optional actually). The Technician-tree skills Sharpshooter and Rifleman are useful for the M308 but if you ace the 2 said skills in the Ghost tree you will make up for the loss(they do basically the same but also add damage and critical hits). With the bigger the better suppessor the M308 will cut through bulldozers like through hot butter whithin one second and if you can aim even from a distance. Very useful in death wish.
You can take my basis and configure your build as you like it. For example in cook off you rarely get a hostage and your teammates will convert it in the rare cases when you actually do or just kill it so you can get something else instead of Hostage Taker if you want to play maps like this. On the other side, in Breakout Day2 you can get a hostage at the beginning behind the desk at the left and it won't be touched by the cops until the end -> constant healing.
Make sure you always run or crouch, aim for the heads and dont waste ammo by making single, precise shots.