Drop Tuning on a 4 String

[theycallsmecoop]

Hey guys. I play a four string in the drop C, wondering what my best option for string gauges would be and how I should set it up. Currently set up for B but tuned up and my strings from top to bottom are 120/90/75/55.

How much thicker do I need to go in order to make this beast growl like a Five-string without having to own one?

 

[lz4005]

Hey guys. I play a four string in the drop C, wondering what my best option for string gauges would be and how I should set it up. Currently set up for B but tuned up and my strings from top to bottom are 120/90/75/55.
How much thicker do I need to go in order to make this beast growl like a Five-string without having to own one?

Unfortunately the answer is "some thicker" if you don't like how it sounds and feels now.
There isn't a magic number someone else can tell you.