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As all the points are correct and tested dozens of times, I would only change the deck height to .050" and run 44 IDF's, as the 44's run out the 40mm Dells. They perform 180-190HP on Type 4's here, they do that in the US, too! Even 103mm p&c's would work for a long time, if you rework them correctly. The poor cylinder and ring quality that you get in the US is the main reason.
German cam measurement is different as we have nearly 20° more duration on our cams. A 316° Schleicher runs as an Engle W-120 with 294°, so just subtract 20° and you have a US measurement.
44mm x 38mm valves would do their job, too, if the complete head is p&p correctly!
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