Okay everybody, it is now very clear to me that the breach seal is limiting fps. I am shimmying up gradually by putting dental floss in the groove. Using the flat, waxy kind, compresses nicely when the seal is put in and compressed from closing the breach. After raising the seal a good bit there is no benefit on fps I put a small amount of Gamo airgun oil on the seal. Tell-tale smoke coming from the breach are during firing. Here's the interesting part: When I put on more oil so that it runs underneath the seal fps rises significantly but only for one or two shots. I am convinced that air leaks under the seal, not over it.