Pulseaudio is always terrible from a latency perspective, from what I've seen. The blocksize REAPER defines is used for internal processing, Pulse still ends up making things long.
The best solution I've seen is to use JACK with a plug-in to allow PulseAudio apps to be routed through JACK. I forget how I set it up, I believe there was a debian package to do just this, and you launch JACK w/ qjackctl and it runs the necessary scripts... It gives you low latency REAPER and also allows other apps to play.
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