Spoon I feel the need to write out a list for my suggestions for insane mode from Chapter 9 Human to the end of the undead campaign ( excluding your custom chapter )
Chapter 9 H: Malganis level 30 ( or just add the hp to his lvl 10 form that he would as lvl 30 ). It is not as ridiculous as it sounds, it won't be 3x his lvl 10 max hp because that has his starting HP as a lvl 1 dreadlord taken into consideration, which is around 700. He NEEDS this because the combos of both heroes pounding on his + their spells kills malagnis too quick ATM, and he is meant to be the scourges counter to uber arthas in this level. Also strengthen the purple base to the east, if it dies too fast then the humans will ONLY be attacked from the top, so long as they aren't stupid as to expo at the teal base north rather than at purple. Also add some AI modifications to make undead better, as right now Malganis only spawns when arthas returns, so arthas can fuck around while falric takes on the undead and whittles them down to nothing.
Chapter 1 UD: Not much as lvl 1 heroes don't make a big difference. Add in more units towards the end of the level, but rather than adding them to existing groups place them apart, as you avoid massing them in spots, allowing the heroes to run past them. ALSO it should be noted Falric ought to have the same MS as arthas regardless of if he has a horse or not because if he doesn't he won't be able to do much in this level.
Chapter 2 UD: Improve AI + raise the level of the paladins. A very simple level.
Chapter 3 UD: Improve AI a lot + raise sylvanas to lvl 9. Yes it will mean she has her ult but together the heroes can take her down easy, especially with ghoul traps. Also this level is very easy so long as the undead don't destroy all the trees to their base. If they do so they open multiple entrances to their base. Other wise this level can be won just buy massing necros and massing skeletons.
Chapter 4 UD: Improve AI A LOT + Sylvanas lvl 12 + a few more towers at way gates. This level needs a difficulty added as the forces the elves send are too weak. So long as the undead unsummon their base everytime they move to a new gold mind, meaning their forces aren't spread out, this level is easy.
Chapter 5 UD: OH second best level only to the black rock and roll level. Increase the runners HP by 200 % + Sylvanas and archmage lvl 15 + AI improvements. The runner's additional hp is not as huge as it may read, if you set your gargoyles to auto attack you 'may' have more difficulty, as they move FAR faster if you have them run infront of the runner rather than let them chase. This level needs the AI improvements badly, with both heroes having their ults the elves need the extra strength.
Chapter 6 UD: No new hero so the difficulty can't be over the top. Either increase all the heroes to a lvl 10 or higher status OR configure the trigger for the red base to attack the undead after 17 minutes rather than after all the other orc bases have been destroyed. The level with still be quite easy to beat as you need to kill the orc bases fast ANYWAY in order to survive.
Chapter 7 UD: Tough one to update. The heroes can't be lvled up higher as their HP has been adjusted in consideration of the deal coil + frostnova nuke, plus the golems rock spells. Just improve AI.
Chapter 8 UD: Two lvl ten heroes... Increase the arch mages hero lvl to 15 and improve the enemy AI dramatically. The only issue with this level in single player is the micro which is required, which is rendered obsolete with an extra player. AI MUST be improved in a great way.
)
