Increased power is generated by a racket swing path that goes slightly to the outside ...works for both FH & BH ....when setting up for the swing, purposely move away from the oncoming ball for sufficient space to effect this technique.
..."doesn't matter if we are hitting cross court or down the line... you always want to be hitting from close to the body ...to away from the body" ...Florian Meier (YT)
...this in to out is subtle ...still use Macci's linear swing 'cos it works well ...but within that swing go for a few degrees of in to out for enhanced power