I would never advise one to use more than 50mg dbol.
I would run one or the other personally - i know 'balisong' ran the two together (alone mind you) and liked it, but i would not recommend it - the results are so similar to each other and they are for the most part interchangeable - other than drol likely having progestogenic activity.
I found 100mg drol much preferred over 50mg, and i dont enjoy over 40mg dbol full stop.
Alongside test, you are likely to have MASSIVE estrogen issues with dbol AND drol.
As for the liver risk - that depends on the person, as a general rule of thumb; you would want to keep the ranges of 100mg Drol OR 50mg Dbol MAX doses, or any combination of the two - for example, 50mg drol and 25mg dbol. 50mg drol and 30-35mg dbol would not be much more strain on the liver than either one dosed at its respective max.. but it is recommended to know where your liver health is at before running higher doses of either drug IMO.
I would say however, that with dbol's primary aromatisation into the potent estradiol, drol's progestogenic activity making estrogen more effective AND test aromatising.. you will need to worry about the estrogenic sides over the liver toxicity.
I would say get a LFT beforehand, and know how you react to dbol+test/drol+test seperately before deciding to run the two with test.