Darth Tyranus developped force lighting power in 10 years time, but Darth Vader spent 24 years with Palpatine and he didnīt acquire that skill. We can suppose it is due to the bionic or cyborg implants, both hands arenīt natural.
But In SWTFU, Vader Secret apprentice developped force lighting power, well probably because he has all his natural parts. A small incongruence with the Sw facts could be Vader throwing force lighting.
But Vader, Anakin a powerful sith, former jedi must have alternative to equal this lack of force lighting
He overcome Palpatine in Rotj with an Herculean feat, lifting the emperor and sending him to the DS2 reactor.
Please share your opinions about the acquisition of force lighting among sith.