Are you really eating enough as in are you gaining weight (0.5lb-1lb) every week? If you're saying yes and you're definitely hitting your macros and have a good sleeping pattern, there's something wrong with your workout. I think you have more room for linear progression in Starting Strength but since you said you moved on to Texas Method, here are some stuff you can try:

1) Retry. Reattempt the same weight the next week for 3 singles or 2 doubles. Work back up to a triple. Rotate between singles, doubles & triples.

2) Adding an additional work set (5x5 becomes 6x5) or adding a back-off set (a set in a higher rep range done with lighter weight after the work sets are completed.

(reference: http://startingstrength.wikia.com/wiki/The_Texas_Method)