http://www.analogueseduction.net/mic...-adjuster.html
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I'm not familiar with the cart dimensions, but it looks like you've got 3mm acromat on there. Thats at least 2mm higher than the Rega felt one.
I'd suggest somethings amiss?
You may get better results with a higher resistance set of loading plugs with the Hana SL.... The stock ones supplied with the Arkless 640P are 100R but I had a look at the Hana spec and 470R appears more suitable (it says >400R recommended). I can supply a set for £15 delivered if you don't wish to make up a set yourself.