Tigger, I see another big change happening, starting late last night. The last 2 days I received record G traffic with good conversion too. Today the switch has flipped again and my sited have all but disappeared from the SERPs again.
Yeah, I got hit on April 1st, then later that day everything corrected....now this morning April 3rd, back down the garbage chute.
7 year old white hat site. Not even a smudge of "over SEO".