Alternative Mail Client Yosemite College

IIRC this community is one that permits some amount of OS-X venting along with general help. If not, my apologies. I consider OS-X my 'least bad option'.
So two things of note. I had been using a 2006-era MBP for a long time. Being a 32-bit machine, it could not go past Snow Leopard. It had a number of issues, but Mail.app was not one of them. No lag in my 40-50K messages across 8 or so accounts. Hitting the 'delete' key instantly sent me to the next message, everything was pretty snappy unless it was reindexing a mailbox or something. I finally replaced that with a late 2011 15' core i7 MBP running 10.9. Nice machine, very happy with it, but all that extra CPU power and I find that Mail.app lags. A slight delay on everything. Goosebumps escape from horrorland game. Even something like 'splat-n' and starting to type a contact's name is slow enough that the first few characters I type are lost. Navigating the mailboxes involves a fair amount of lag. Both laptops were SSD-equiped, FWIW.
The MBP overall is so nice that my core i3 hackintosh desktop has been somewhat neglected. I just upgraded it this week (bought a 10.7 license, but went straight to 10.10, clean install). Bear in mind this is my first taste of 10.10. I've been happy with 10.9 on the MBP so I didn't upgrade that yet. The hackintosh has generally been nice - Chrome's fast enough, Safari is nice, Fusion 6 works well, quite happy with it and the 'flat' look is OK. Do wish I could adjust the font smoothing a bit, but I'll dig up that hidden setting one day.
So 10.10 Mail.app.
Slow. Way slower than 10.6 on the same hardware. About 4GB RAM free, CPU meters don't show them getting pegged. Moderate disk activity. With Mail.app not the foreground app, mousing over to it, clicking a message and waiting for it to display is about a 3 count. Is this normal on dated (but not truly ancient) hardware?
Behavior-wise, this is what I actually came here to ask about:
• I like threaded view ('conversation view'?), but I do not like that in 10.10 this pulls both the Inbox and Sent items into the thread. When I delete an entire thread, I *never* want to delete my Sent messages. I cannot find a way to change this short of turning threading off.
• Sender names - I'd really like to have the 10.9 behavior of displaying the email address and name. Again, if there's a setting to alter that, I can't find it. Not seeing the sender's actual email address is not acceptable for me (sysadmin, former pine/mutt user, I just need to see these things, sorry)
• Same as above in the message list
Windows 10 iso link. • When setting the view to have newest message on the bottom, if you come to Mail.app from another application and hit an arrow key (up/down) once Mail.app has focus, it jumps to the top message (ie: oldest). Probably a bug, not a setting, but who knows.
I'm trying out a few other options, but I've already given Mail Mate and Postbox a go in the past. Mail Mate does not deal well with lots of message, Postbox reminded me too much of Thunderbird's 'not quite native' look and feel. Other options for someone in the 'get off my lawn' crowd?

Alternative Mail Client Yosemite College

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