I have just finished orc expansion campaign
It was cool, but to be honest only XOrc6, XOrc11 and XOrc12 were difficult (but XOrc11 was hard only at beginning). Few of them could be finished before AI got to final units, for example in XOrc7 player can easily destroy blue AI before it will get to the knights.
In my opinion, your campaign version is better than original, so well done
It was fun to play
XOrc6 I had to repeat the most times. I think it took me about 10-15 tries before I beat it. I have finally won by destroying blue AI first with mass bloodlusted ogres and trolls.
XOrc11 I focused on white AI with my start army. I have destroyed it's core base on the 3 try and fighting vs blue only and few white gryphons (white trains these until it has a gold) was not so hard. Finished it with dragons on haste and bloodlust.
XOrc12 was always my favourite
. Huge army at beginning, all orcish heroes with Deathwing. Also I had strong nostalgia feeling to that specific mission cause together with my brothers we couldn't beat it for a long time. It was 20+ years ago but still it's a wonderful memory
In your version that mission took me more or less 8 tries. It was hardcore much more than in original and I had to pick same strategy as in previous mission, so I used my start army to finish the most dangerous enemy - purple. Without purple it was still hard, but after 2h of tough battles I did it.
I found one major problem here. Blue AI took all of the oil patches before I wanted go on sea. So... I used cheat to get 10000 oil because I didn't want to start again
I think it's ok that this mission is 3 times harder but I think it would be nice to give player a lot of oil at start so he wouldn't have to hurry too much and just enjoy a fight.