Hi! I want to use Drop C tuning on my 4 string Yamaha BB424 bass for a more heavy sound (I like the heavy sound of Shavo Obadjian from System of a Down). Question 1: So what if I buy a 5 string set and use the fattest 4 strings for example the Ernie Ball Power Slinky 50-70-85-105-135 (compared to Ernie Ball power Slinky 4-string set 55-75-90-110)? Question 2: is using such strong strings dangerous for the bass guitar neck, i mean could they deform it? I suppose I will have to adjust teh bridge al well.. I've never done this before, so I really appreciate your help. Thanx!