Yahagi as of april 7th 1945:
By the time she was deployed with battleship Yamato and destroyers Asashimo, Isokaze, Hamakaze, Suzutsuki, Kasumi, Fuyuzuki, Yukikaze and Hatsushimo for Operation Ten-Go Yahagi had her appearance changed again, tough for the last time; midship rangefinder and searchlight positions where changed with the searchilight reduced to one and beign fitted onc enterline, and the director towers beign enclosed in a wider structure comprising a platform for anti-aircraft machine guns.
other modifications where the fitting of a type 13 air search radar on the foremast and two type 22 surface search radars abaft the bridge near the main gun director, a control room for the radars was also added aft of the bridge; anti-aircraft armament was increased to 10 triple and 28 single 25mm machine guns, for a total of 58 barrels, a single Aichi E13A1 semms to have been retained untill her sinking.
a little extra about the seaplane thing, i initially doubted that in april 1945 Yahagi would had still carried seaplanes, but this picture seems to prove me wrong:
it's taken by US aircraft during the attack wich led to her sinking (and also that of Yamato and four of the eight destroyers), i've circled in red the area i'm talking about, as you can see above the catapult there are two objects that seems to be a float and a wing of a seaplane blown sideways onto the port side by some bomb blast