Dream Drop Distance End game power leveling/farming help.

Hello all. Its the first time I have posted here in a while.

I finally got around to putting in II.8 HD after buying it in January just a few week ago (I don't get to play much). 25 game hours in, I am at the final save point for both Sora and Riku in The World That Never Was. And something has occurred to me- I never found myself grinding, nor was I ignoring bonding with my spirits. Yet, I made it to the end of the game only fully completing the ability link boards for 6 spirits for each character. Mostly the starting spirits you acquire in Traverse Town. My abilities for both Sora and Riku are full of holes, and there is a trophy for maxing level, so I figured that I can make a task of leveling to 100 as well as gaining all abilities/commands by making at least one of each spirit and completing their respective link board. Sounds simple enough, right?

I have noticed leveling is already slowing down and I am only about level 43 for each character. And LP seems like a huge pain to farm. I have been running back and forth along the final world defeating all the enemies, but even then the grind is slow. I have googled better methods for both- I have read having an ability that increases your experience when in critical health can help dramatically. I don't have this. As for LP, the best way is to buy a bunch of water barrels and use those, I have read. Munny isn't as readily available in this entry as it has been in the past, and to buy enough water barrels to max 2 spirits, it seems like it will cost thousands of munny. Thus, now I need a way to farm munny efficiently.

Does anyone have any advice on how to do this in a way that won't take 100 game hours? Some of these trophies seem ridiculous- level to 100 in a game that you can complete at level 40? Max out all spirits/gain all abilities when you can complete the game with 4-6 for each main character through natural progression, but then have 40 others that you will have to grind through? It just seems the game is a bit imbalanced when you compare the length of the game with the amount of post game content you must complete to Platinum the game. Drop 100 times? I just hit 22 drops.

Anyways, TL;DR, What is the best way to level up to 100 fast, complete spirit link boards, and acquire large sums of munny end game? Thanks!