RNG manipulating doesn't boost odds, it guarantees a shiny by analyzing the current RNG seed of your game and predicting the exact frame your game will spit out a shiny. It requires external hardware, i.e, a computer program
It's not going "too slow", there's no faster way to do it. It takes a while. You can also wait until the daycare and get a foreign ditto to breed with Masuda Method at higher odds.
