You used the wrong T4 as overfuse. There are 3 different T4s, one of them (the one you have) has 2250 base magic attack -> this is exclusively to be used as an underfuse. The other 2 T4s have 5200 magic attack base, one of them has slightly higher yellow stats, the other one has the skill that increases atk on proc (Jorgoths Masterpiece). Usually people use the one with skill as the overfuse and the one you have as an underfuse
Edit: Also no need to +15 the underfuse at all, underfuse always applies at +0
Can the T4 be reidentified or is it wasted time and Kinah at all....
Is it possible to reidentify the T4 or would that just be a waste of time and Kinah....
The type of T4 is locked in from when it initially transitions from T2. The way to recognize it is through its stats. Unfortunately, the current use for your T4 is primarily as underfuse material after you complete your new T4, likely Jorgoth's Masterpiece. Altering Jorgoth's weapon after enhancement isn't an option.
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