That is less an issue of not enough chips, than one of players who are not optimally managing their stacks. Pot winners with lots of T25 chips should be calling and making bets with those chips, to distribute them back onto the table. Other players with low counts of those chips should occasionally call with a larger denom chip and get change from the dealer. Players should never make change among themselves (to avoid potential arguments and possible collusion).
You propose a 25% increase in chips, not a trivial matter from both a cost perspective and a chip management perspective. 12x is plenty. If players aren't managing stacks, it would make no difference how many were on the table..... the pot winners would just have more of them, and the shorties would still run out.