I may have read it wrong but he says the problem is with the one that *has* the spring in already.I use a standard 6-battery-pack too - I don't know how 2 more AA batteries would cause it to jam more
As I say above, try putting your anti-jam spring into Halo B to see if it makes a difference.
-Will
All I can think of is the eyes, OR, the spring under the drivecone (this is what caused similar problems with mine)