You talk about putting on mass and you talk about the abs diet... they are conflicting goals. In order to put on mass effectively, you likely will not be burning any fat. If you control your diet well then you wont' put on any excess fat but I really dont' think you'll lose any.

In order to get abs you have to drop your bf% to sub 10% generally.

You really need to pick what you want to do? And why only 3-4 months to get big?

IronWorker