Hi Swanny, have tried to replicate your pic of the f-hole height difference and I can't see any need for any propping up. Attachment 29924
And from the control side as well Attachment 29925
These are an offset shape and the f-holes are cut into the arch top at a different place compared to your ES which is making it look a bit exaggerated, from your pic looks fine to me. Would hate for you to ruin that top.
Also be aware that you will need to make some kind of tapered spacer if you are going to use the trapeze tailpiece.
Blurple.