the idea is good but im not sure how will it impact on 800 ap games (if anyone plays them )
4-5 archers builds are indeed problem of mindles laming being able to go to the top... but i was never fan of unit limits...
and for example i really want to play 4-6 sparkling army one day
but 5 archers builds maus be dealt with.
In battle game where im main designer - ranged units are weaker than they should (considering ap cost and killing potential) but they are still useful as a tactical advantage forcing enemy to attack. So having shightly better archers than opponent makes you in good tactical position but if you have them too much than you wont be able to shoot hth companies in time.
So propably lowering STR (or ACC) or rising AP cost (but im for lowering STR - because in TT conf - lion archers was cheap and good only in groups of 3 and only Vs non armored enemy) of both Lion and Ram bowmans can do the trick even better - becouse you can still play with 5 bowmans and try to be effective - but only if you are really good