Thank you mebloo!
Actually this issue was a problem since the begin of development. Mostly because of two players option. I've even tried to use joints to keep the actor/platform movement smother. It worked fine for 1 player but was a mistake for 2 players.
On the end, I kept the default solution of set x/y speed for platforms and a customized Ride Platform behavior.
Anyway, would be nice to hear about any other solution for smother platform movement.