Wait, you actually did that grind twice? Congrats on maintaining your sanity.
It's not hard. It's only time consuming. I came up with a good strategy on how to deal with him painlessly. Takes about 7-10 mins and you barely ever need to restart.
Here's my easy mode lr guide.
Team:
Chilled
Tao
King vegeta
Mecha
King cold
Android 16
Friend chilled (a must)
Here's my main difference with most people. The items. Instead of trying to nuke him with dual chilled. I bring Ki items.
Items: dog president, fruit, dende, senzu.
Deal with lr normally during his first two forms. Most of the time we can kill him off with no senzus. Once in awhile you might need 1.
During his third form, go all out. Two fruit and two dog president will give you 8 kis for 3 round. Make sure everyone supers every single time. It's not hard especially if you grab the Ki tiles before fighting him. After that 3 round. He will either be dead or have almost no Hp left. After your super barrage, his attack will be severely weakened. Even if you can't kill him off in 3 turns, it doesn't matter. He's not a threat anymore. It will be easy to dispose him on the fourth turn.
The great thing about this setup is you can eat lr super and go on with no problem. There are times when lr is spread out and you can only block 1 single attack with int. Leaving the rest vulnerable. But with dual chilled, you will have enough Hp to go on if you start the turn with full Hp no matter who ate the Super in the face. Additionally we also have 4 healing items with this strategy instead of 2 if we are nuking. Normally, you will only need 2. With 2 spares, it's never urgent or a close fight.
I actually never lost a fight against lr with this strategy.