Thank you for asking. That is exactly what I thought the bladeskill was supposed to mean but I guess the wording was quite bad (they could have fixed more things in UP to be quite frank with you).
@2: Small nitpick ... it is a d6 weapon by default (if you are medium that is). Which would be replaced by GUS damage if higher. Otherwise this is a good idea. Pretty devastating since Deadly Fist is a strong Archetype to begin with (especially as a wis knife with Gifted Blade and/or a contemplative dip and going Dark Tempest afterwards).
edit: Just realised that Feral Heart should also be able to reach +18 (depending if you have a focus item for the claws). Feral Heart has the issue of scaling really bad though. You might have to go Contemplative/Dark Tempest and pick up some extra natural attacks via powers to keep up. Feral Transformation is nice though.