This would be a great opportunity to give your Tormek small knife adapter a try (Yes, I’m the guy who has been commenting on your youtube videos recently). You should find that you can get lower angles with the adapter because it both raises the knife further above the clamp and it holds the knife by the handle so it almost suspends the blade over the clamp with nothing to obstruct the movement of the stones.
If you have one of the newer low angle adapters it should be compatible with the gen. 3 clamp. The older ones are apparently not compatible with the newer clamp design.
I have no idea about the riser block.
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