The LHS mallets have a lightweight synthetic core and a soft yarn, so they get a weak sound and wear quickly. If you must stay with Malletech, the Concerto line will give you maximum durability and the best sound. Try the CN9 or CN14's.
Otherwise, I'd suggest the Firth Van Sice M113 or M114, the Innovative Percussion Soloist IP240s or Innovative Percussion William Moersch IP503's. The Concertos and mine have a heavier synthetic core; the Van Sice and Soloists use rubber cores (similar to the Burritts).