I just switched to stock barrel bottom on my Indy trucks, hard Bones top with no washer. Stock Indy bushings are squishy as hell at 170lbs. Real question though: do those stock bushings firm up or soften up over time? I've heard both claims on Slap, and I've always gone with Bones except on my Ace trucks. Bones hard were too hard for me until I started using Rip Tide pivot cups, and they make such a difference that I won't think about ever not using them even though they're fuckin $17 or some shit--I got em on all my setups. But yeah, the stock barrel bottom/hard Bones top isn't loose enough unless the bottom bushing softens up, but if it doesn't I got a pile of bushings to feed the madness.
Looking back over, I forgot to add info for this one, but it is easy enough in another post.
Re bushings wearing in, it is different for different brands or even for different bushings from the same brand.
Bones definitely get squashed and go a lot softer when worn in, hards go from almost rock solid when first put in, to compressed to about medium feel when almost dead, which is fine if that is what you want, but for a few people I know, they go through Bones hard bushings every month or two as they just compress and squash out. Even to look at them, they are so different when "dead" compared to when new.
Indy aftermarket bushings get softer as they wear in, so might start off fairly solid feeling but then then have an easier flex and snap feeling when worn in, if that makes sense.
Indy stock bushings start off totally mushy with not much snap back but as they wear in, they tend to feel like they firm up a bit and definitely have a really good flex and snap back from about half a dozen sessions in until the end of their life, which for the new ones is still a long time as they are still good, as far as I am concerned.
The only other thing to note is when people crank them down too hard or don't treat them with care when new, they will tend to not work as well as they should or have a much shorter life. Some of my boards have very old bushings in them that others have looked after and are still perfect, even if they look like they are well past it, but some other almost new ones have pretty much been left as "unusable" after being destroyed by people who didn't quite understand how bushings need to wear in. That goes for other brands too, not just Indy, Bones, or Thunder, Ace, etc.