I am also 十幾年無玩車, 而家玩返, 之前味玩過 M車, 但現在主力玩 M車. I don't have M05, but I think Tamiya M 牙差 only can put "傑"身[雪油], 入差油 will leak.., about避震, 我以前都和你一樣不知如何是好, because I never play 頭驅 before. But now I using same oil at front and rear, only the spring difference. Front little harder than rear.
But if you want 平路 / 沙地 兩用, the ride high must be set again when you play change to 平路 / 沙地