I increase 1/4 strength a week, until either tip burn, or at full strength. If you do see tip burn, give it a few days, maybe water with straight water, then hit it with that same dosage of ferts, just give the plant a little time to build up to a fert level. it may need it... if you still see tip burn, you should back off the strength a lil bit.
Each strain may require a slightly different dosage for optimal results. As a grower its your job to learn your plants and what they like, then give them everything that makes them happy. And cut out as much unhappy as you can.