You are right.
But what I meant is that the leading edge of the trigerring pulse is delayed as you do for the narrow pulse.
Its trailing ledge should follow it (the end of the pulse) not before the 90 deg. of the half cycle.
For instance, I use a triac at the primary of the transformer to regulate the charging current. But as pointed out by other members here, I add a choke (with air gap) for DC current in series with the battery. If the voltage range of the mains power lines is rather wide, I use 2 or even 3 triacs (after adding 2 or 3 transformer terminals at the primary side) to avoid narrow high charging current pulses.
You can also use one triac, rated for high current, before the rectifier diodes. But in all cases a choke is needed. For my 100AH acid lead, I chose its inductance to be about 100uH for 20A charging current.