Getting a buffalo bar like Bendthebar will give you a longer bar to get your hands on and it's curved slightly, so your shoulders don't get so far back.
I have really really tight pecs and shoulders too and I have to use a bar that part of the bar won't spin and I have to touch the plates.
I have a long piece of PCV pipe I keep using to help stretch, I'll sit here on the computer and just hold it and stretch. I haven't done it enough regularly to tell a huge difference but it isn't AS bad.
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