It looks like the NTRP 4.5 description is where one should have a good topspin backhand:
"You have developed your use of power and spin and can handle pace. You have sound footwork, can control depth of shots, and attempt to vary game plan according to your opponents. You can hit first serves with power and accuracy and place the second serve. You tend to overhit on difficult shots. Aggressive net play is common in doubles."
4 x IG Prestige MP, 70 cm, 376 grams, 386 SW, ALU Power @54, Prince Syn Gut 16 @58