Hey!
Your problem is only depression or also any anxiety disorders/OCD? I am not a doctor, but many people here mentions Remeron as a safe option and a good choice if you are having problems related to bad sleep and low-weight.
That being said, each individual has his own experience and it's hard to know apriori what works best for you. Unfortunately, much of psychiatry is about trial and error. I am currently at Zoloft because I have OCD, and I noticed no increase in T volume when I raised the dosage from 50mg to 100mg, but I can't really say for sure about what happened to me when I entered the 50mg dosage (my story with AD is shared
here).
I think the important thing is to find a doctor that you trust and share all your problems and concerns with him, in particular, your worry about tinnitus. Remember also that he is working for you and to help you, so you should show him your preferences and worries.
As for your questions:
1-) Zoloft 100mg;
2-) Hard to say, there are positive and negative experiences with all of them if you search hard enough. Consider how much do you need them and, if that is the case, check with your doctor the most adequate to your profile and concerns;
3-) My experience under 100mg is that I am overall more numb, and T is worrying me less. I am searching less and less the sound in my head and this is good because breaks the cycle of attention/volume increase due to the lymbic system... T became a much minor problem now, even if I can hear it while watching TV, I kinda can filter out not obsessing over it. But I will not lie: I sometimes get worried about being under ADs and I idealize a near future without them.