Why are you using ASIO4all and not the Focusrite ASIO driver?
If you have an echo it's because you're hearing direct monitoring from the Focusrite and you're also hearing monitoring through Reaper.
You should choose one or the other so if direct monitor is turned on you can switch off monitoring in Reaper.....you will have no latency but then you can't hear any FX on the reaper tracks
If you have to monitor through Reaper for amp sims or similar then you'll need to set the interface buffer setting as low as possible and make sure no FX are adding latency.
If you have a 2nd gen Scarlett you should be able to get reasonably low latency.
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