those results seem fine... theres no big boost going from dual to tri channel... intel never said it would...
dual imc is still way faster than dual MCH... so while going to tri channel wont give you a big boost, having the memory controller integrated helps mem bandwidth a lot.
how much that bandwidth helps the cpu to get higher scores is a different storry though... that depends on the cpu and application...

same for smt, in some apps it doesnt help, in some it does... it depends a lot on what apps you actually run.
unfortunately there are very very very very few desktop apps that can make use of more than 4 threads