Converting a USA C of A from Standard to Experimental

I own 3 experimental - amatuer builts which I thoroughly enjoy.
However the restrictions on them are no where near as restrictive as
experimental - racing/exhibition.

So I wonder if I "substantially modify" a certified glider (such as
adding winglets or Schuemannizing,) might I be able to successfully
argue that it belongs in the amatuer built category?

Paul G

Just a reminder that Operating Limitations are a NEGOTIATED document
with the FSDO.

You do not have to accept their first draft suggestion.

Also be sure to get Experimental Exhibition/Racing as it allows more
freedom than one or the other alone.

With my OP Lims the FSDO and I negotiated the REMOVAL of the Program
letter requirement
added Aerobatics as specified in the POH and my area of operation
expanded to "Not densely Populated areas" except for
landing/takeoff (Marked in yellow on Sectionals).

Just for the record my FSDO was very receptive to any suggestions that
made sense or proved to be a common practice.

They even did the inspection saving me the cost of a DAR.

It was easy and quick (1 month) to get it all done and I was
pleasantly surprised after hearing other horror stories in dealing
with the FAA.