The Corona lockdown in Germany brought me to experimenting with stings on my 4-string again. Decided to give exl160-bt from D'Addario a shot. Tension-wise excellent. Tone wise very balanced from string to string and across the frequency spectrum. Here comes the downside: The E-string (d-string ot be exact...) died on me within 3 hours playing time(sounds like my .105 Chromes). I pay attention to proper string installation (crimping; twisting etc),clean hands as well as cleaning the strings after playing... GHS Boomers also were very short-lived on the E-string on me (1 rehearsal)... The coated strings (Ibanez; DR Black B.) don't show this problem. Do I have a killer body chemistry?