OOF, that was some ouch against Yoshi. The biggest problem I've had with Talim, and this isn't you in particular, is the ability to initiate with a low is slow, predictable and doesn't do enough damage. Yoshi's air style is quite a bit stronger than Talim's and the character tier difference is blatantly obvious the last match when you get a string of 4 mixups (I believe) to initiate a match and Yoshi gets a stun and his 2 hit to finish the combo and you both have equivalent life. You beat him 4 times in terms of move choices, while he beat you only twice, but the life differential would make you believe that you were playing equally well. To compensate I personally have failed(watching too much clone wars but leaving this phrasing I am), but Talim is merely my 4th character after Siegfried, Mitsurugi and Raphael. One thing I tried was writing a chart of EVERY low move that Talim has and playing with the visual reminder of my moveset for lows. It didn't help...K-A is bad and not an actual combo, leaping can be countered easily with any midair attack and trying to mixup will finish with legitimate damage but forces you to massively outplay your opponent. I mean...massively...like you have to beat your opponent with move choices 20-30 times per battle. Comparing this to a Siegfried battle where 5-6 decent choices deal 100% damage and you can see the tier difference clearly. I'm sorry I don't have more to offer in terms of constructive criticism but that's because Talim isn't a character that has a lot of flexibility at a high level. A lot of her moves fall into the same category of counter, making it rather simple to counter the majority of the initiates if not all of them.
I will say that there's a distinct lack of sidestep and counter-hit in your current game and it would be great to add some of that in. You have a great straight-on feel but in tournament play it's pretty guaranteed that a pause of over probably 250ms will cost you the guaranteed ability to initiate even when you are playing a female charcter against a male one. By sidestepping during a period of relaxation mentally you can continue to "play the game" while giving yourself a little mental break and ensuring a limited set of moves will be used to hit you during this period. I would liken this to crouching in terms of the reduced moveset that will be used against you and the easier ability to defend. The reason this is so important to my talim play is I need this ability to step back and think extremely often because Talim is not even a top 3 character for me. With a reduced offensive ability I rely heavily on my defense (I am also regarded as the best defensive player in my playgroup) and with a narrowed moveset it becomes far easier to defend. I'm not saying this is something you should pick up immediately and use in tournaments, but if you give sufficient time for the knowledge and attitude to sink in it could allow you to take your more relaxed and logical attitude that you take into casual games and apply it more frequently to a tournament and more competitive atmosphere.
I will say that there's a distinct lack of sidestep and counter-hit in your current game and it would be great to add some of that in. You have a great straight-on feel but in tournament play it's pretty guaranteed that a pause of over probably 250ms will cost you the guaranteed ability to initiate even when you are playing a female charcter against a male one. By sidestepping during a period of relaxation mentally you can continue to "play the game" while giving yourself a little mental break and ensuring a limited set of moves will be used to hit you during this period. I would liken this to crouching in terms of the reduced moveset that will be used against you and the easier ability to defend. The reason this is so important to my talim play is I need this ability to step back and think extremely often because Talim is not even a top 3 character for me. With a reduced offensive ability I rely heavily on my defense (I am also regarded as the best defensive player in my playgroup) and with a narrowed moveset it becomes far easier to defend. I'm not saying this is something you should pick up immediately and use in tournaments, but if you give sufficient time for the knowledge and attitude to sink in it could allow you to take your more relaxed and logical attitude that you take into casual games and apply it more frequently to a tournament and more competitive atmosphere.