TSH can never be below zero !
Is it safe to have a TSH that low?
No it is not !
Can I even upgrade my meds to 125 levo a day?
No you can't, actually you are hyperthyroid and need to reduce your dose a little to bring your TSH a little bit higher, between 1.5-3 .
will my TSH drop even more when I go to 125?
Yes it will and become close to zero and this, in turn, will make you more hyper !