Just add:
to M1, lower M774 to Tier 1 Modification and remove M735, Done.
It will still have the lowest penetration off all 10.3 MBT’s but this will remove the god awful M735.
And in my opinion 120S doesn’t need M829A1, M829 @ 491 point blank is more then enough firepower for a 10.0.
598 point blank is a little overkill if you ask me.