[Elecraft] 3 1/2 Quick KAT2 Questions

[Paul Clay]

I'm in the process of installing a KAT2 I just 
built in my K2 serial 3640.  Everything's working 
ok, so far, except that when adjusting C55, I get 
a sharp null but cannot dip the voltage below 
.010 (average, the reading on my DMM varies 
between .009 and  .011 when I've set the K2 power 
to 5 watts).  

According to the Elecraft Reflector archives, back 
in 2002 getting the dip in the range I'm getting 
(.009 to .011)  was considered perfectly 
acceptable.  Does that still hold true today, or 
have opinions on this subject changed?
Is it not a problem that on 17 meters and above I 
get the "HI" reading (after having nulled the 
voltage to .010 within the 40 meter band per the 
KAT2 manual)?

Last, as the KAT2 manual said it might, the toroid 
core for L1 is pretty loose.  Any reason I can't 
use a dab of hot glue to glue the core to the 
insulated winding?  (or, alternatively,  insert 
one of those "conical hat" rubber insulators used 
to support the enamel wire wound toroids,  under 
the core of L1 to support it so it won't rattle?  
Everything else is so "tight" and snug on my K2 
that I really like to secure the L1 core if doing 
so wouldn't goof up the operation of the KAT2.

Thanks all!
Paul, N6LQ