This is not a strong opinion, just some brainstorming: a hero is nothing more than a unit with a certain amount of special rules. It is a highly customisable unit, which is probably the main reason why investing a lot of points in a character can be so useful. 100 points of wisely chosen magic items can buff the hero unit immensely. Choosing a mount that adds 6 wounds triples the hero’s survivability by the same amount. Adding a 4++ doubles it again, etc. etc.
But, the point costs is only an indicator of such wise choices, it’s not the choice per se. Do we really have hero choices that benefit from using 100p of magic items?
With the General on imperial griffon, I don’t feel like we have a lot of useful expensive choices. Anything more than white cloak and maybe a dragon bow or a ruby ring of ruin seem mediocre if anything for the general, and those could be given to any character. Instead of paying 40-50 points for a magic item without any effect I could just get another engineer who might have a big impact on the game.
So, it might be that it is more about the investment in the hero section than it is in the point cost of each hero, because that is a rather limited factor.
With this in mind, why not the Griffons? The captain on griffon is a rather cheap option to get a rather powerful beast. Having three of them might not hurt!
++ Characters [997 pts] ++
General of the Empire [312 pts]
(Hand weapon, Lance (if appropriately mounted), Full plate armour, Shield, General, Imperial Griffon, The White Cloak, Sword of Might)
Captain of the Empire [215 pts]
(Hand weapon, Lance (if appropriately mounted), Full plate armour, Battle Standard Bearer, Griffon, Charmed Shield)
Captain of the Empire [190 pts]
(Hand weapon, Lance (if appropriately mounted), Full plate armour, Griffon, Charmed Shield)
Wizard Lord [190 pts]
(Hand weapon, Level 4 Wizard, On foot, Lore Familiar, Elementalism)
Empire Engineer [45 pts]
(Hand weapon)
Empire Engineer [45 pts]
(Hand weapon)
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Created with "Old World Builder"
[https://old-world-builder.com]
Of course, the bsb could swap the griffon for a demigryph and might be even more useful, maybe depending on the list, it could just be another captain not a bsb, but the list is just going strong on the idea that characters are the better/more useful/more competitive choice.