Just got megan coilovers installed.  Immediately on the way home I noticed vibration ONLY under hard acceleration and ONLY above about 60mph.  All my google searching leads to it being cv joints and supposedly a common problem with lowered cars since the axle is put at a different angle.  Ive had 5 lowered cars before this and never had this problem.  Any one else experience this?  Will raising it a tad fix it?  Its still under powertrain warranty but I dont want the dealer telling me I caused it.....

BTW Im pretty low but not ridiculous.  Basically no fenderwell gap but not tucked

You did get the car aligned post-install, right?  I would also get roadforce balancing to make sure tires and wheels are not the issue.  The lug nuts also need to be properly torqued.  Hopefully the wheels were reinstalled in their original locations.

Aligned post install.  I feel like alignment or wheel issues would create vibration at certain speeds, axle issues would create vibration only under load like hard acceleration which is what im feeling.  I had a mustang once with the same issue on a stock suspension and the dealer found it to be loose bolts on the drive shaft.  This feels very similar .  I could be going 60, 70, 80 etc without giving gas and there is no vibration.  Its only under moderated to heavy gas pedal pressure

Almost sounds like a CV joint or axle not engaged entirely in the transmission?

Sure does.  Im surprised that i have seen any shos besides me with this issue after a drop yet.  Its all over vw, audi, mini, subaru forums...

Talked to a tech at Megan racing.  He said I likely have it too low and it throws off the geometry of the suspension and CV joint.  He sees it alot with Honda guys that slam it too much he says.  I'll keep y'all posted after I raise it

Good luck!