I switched the T5 to E-C yesterday using Sunbeam lights and got an hour or so in. I love these stings and have used them on most of my basses over the years. Traditionally, I have used a DR Lowrider B string, as I never cared for the Sunbeam B, of course not an issue E-C.
On the T5, they are a delight, low tension (but not too low for Hard Rock due to the increased tension of the 35" scale?). For those who don't know, Sunbeams have a mid-forward tone, solid lows, and muted highs ( low zing), perfect for my personal tonal goals.
My T5 relief was .011, not perfect for me but close enough not to mess with. The lower tension Sunbeams allowed the neck to relax close to the perfect for me .006 range, and only 3 strings needed intonation. The enhanced mids will make my bandmates happy, deep lows don't work as well for the genre, or cut through a Les Paul/Marshall combination (even with the deep switch off). This allows me to keep the volume down and still be prominent in the mix.
E-C does require some re-learning, quick thinking and a new approach, but this change is definitely going to keep the T5 in the gig rotation.
Next up: Sunbeams and Embassies.