They're already are weak vs archers, I was just trying to balance them out being strong vs spears. But have you seen bfme1 trolls?
Morgul riders are strong enough to kill un-upgraded tower guards 1v1, getting a morgul fortress early on is devastating for Gondor. I am saying that from experience, and this was before the tower guard did 15% less damage.
What I am saying is make them weaker vs spears, and they'll be balanced.
For spiders, I feel 90 command-points makes them .... not a good idea to buy, and make free.
This is copying someone else's idea, but maybe make the spiders regular cavalry? (Can squish infantry etc.)
atm, they are useless.(spiders)
I am okay with them being weak to spears, if it means they are buffed vs other things, the thing is they aren't actually that strong vs swordsmen, which have always been in every Bfme game their greatest strength. (Which is why trolls were used so much in Bfme1,Bfme2,Rotwk, and of course they were strong vs buildings, and towers too)
The thing about trolls is, you've divided their strengths up (Hammer or sword,or mace, they can be Strong vs buildings or High damage vs units, or just do more area damage. The thing is, they had all 3 at once in vanilla Rotwk, so they are by default, less effective than vanilla Rotwk.)
Can't they make the black riders take just as long as say, Theodon to dismount/mount?.
I think I recall Rj rotwk having a unit called Royal Guards, which could dismount/mount normally.