Ideally, doing shots every 3.5 days (twice a week) will produce optimally stable levels for Test C, given the half life.
100mg/week is the usual starting dose - have you had bloods done recently? Do you use HCG or any AI?
I wouldn't start messing around with other compounds for TRT. Just stick to Test C or Test E, get your schedule and dose dialled in by monitoring bloods every 3 months or so.