Hello. I was just wondering if there is any noticeable difference in the 4mm derailleur housing to the 5mm derailleur housing in terms of ease of routing. My bar setup demands a very tight fit and the 5mm derailleur housing is a bit too bulky and difficult to shape/flex (this is only an issue at its entrance into the shifter/brake levers). The brake housing is fine, it just that damned derailleur housing. I understand the drawbacks of 4mm housing (including plastic ferrules and arguably worse shifting capabilities, which I'm not too concerned with). I just wanted to know whether 4mm housing had enough flex over the 5mm to warrant a switch. Thanks.