I mean... there is some validity to the setup being possibly too much but, more so because of the different embouchure. I played alto more exclusively for years (thought went back and forth; and in high school was more with tenor than alto). What is your alto setup? Note that a lot of alto players play more close tips and hard reeds while tenor is mostly the opposite until you develop the control while loose. Another thing is, unless the leak is too bad, you can blow past it. As in, if you have enough air and diaphragm support. If you are used to the smaller alto tip you will not be able to “fill up” the tenor chamber the same way as there is a difference in making the reed vibrate and filling the mouthpiece/horn. I do think you should get the horn checked out but, I would easily say, even if you stick with the .105, move to a lower strength reed. At the moment, with some experience of alto, I generally suggest no more than a .095 or link style 6* and a 2.5 reed. Technically if you like LaVoz you could try both MS an M reeds and see which you like better but, it would be better to overblow than only reach the minimum required for tone otherwise.