You are cherry picking verses. You jump from 1:14 to 2:23 to 2:11 to 11:40 whilst ignoring all the context.
I'm not cherry picking. The whole book is about how Jesus revealed his glory through miraculous signs (as well as his 'grace and truth'). Those particular verses are consistent with that.
The statement, "we beheld his glory" follows the statement that the Word became flesh and dwelt among us. So, to paraphrase Don Carson, "we" can only refer to people who physically saw Jesus.
There is nowhere where the author is implied as an eye witness to the life and death of Jesus. Furthermore, the people who are said in the gospel to be eye witnesses are referred to in the third person.
Isn't "we" inclusive of the first person?