Ben - we built a sh-- load of em with various angles and sold hundreds of em in all configurations -flat stabs and anhedral stabs - this goes back to 1976
Our clone of the basic Hanno Curare was the Tiporare- and having been thru many examples and changes of this drooped tail setup -including some special purpose test designs - I can say with some confidance - that the droop did change the skid result.
Having said that - the real differences in skid results were really results obtained by shifting CG fore -or aft.
the download required to maintain level flight -in a skid -is more critical -as the cg moves aft - and this is not a finite thing -
pitch varies from design to design --but the result is always the same - move cg aft - yaw the plane and it pitches down this is in a level -upright flight test.
A lot of anhedral in the tail group minimizes this .
some guys moved the horizontal tailplane down and claimed this is a cure - I do not agree.
The CG for a particular design has to be juggled to get things as neutral as possible - and even on a kit job - the results varied from model to model - any speed change affected it - as did wing loading -- on and on ad
nauseum