Well...spoke too soon...back to square one. Just got some pops and a dropout with 4.14.0. at 128 - 3ms (Small enough project, 2 vsts and 5 audio tracks)
I reverted back to 2.5.1 but whenever I try to change the buffer size in the Asio panel, I get an error message and get kicked ouf of Sonar. First time this happens with that specific driver.
I must have tried every driver that was released for the 2i4 with no decent results.
Normally, I should easilly get by with 128 -3ms with an i7 PC.