You may want to STOP customizing your subject lines!
"Emails with personalization in the subject lines had the worst performance, generating the least amount of click rates. Personalizing subject lines is a tactic used by some to get recipients to open unsolicited email. Thus, the decrease in opens due to personalized subject lines is likely caused by people becoming conditioned to delete such messages because they are often unsolicited."
[If you didn't read the reports yet, get them free here: Email Marketing Metrics Report]
Reason # 2 - Yahoo suggested that senders should not customize the subject line by merging in personal information.
[Discussion between StreamSend's Deliverability Manager and Yahoo's Anti-Spam Czar (Mark Risher). Source: StreamSend Email Marketing Blog: Straight From Yahoo]
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Concusion: You decide what's best for you
Success consists of going from failure to failure without loss of enthusiasm. -Winston Churchill
Bare Murkage.........