I have tomato plant food (organic) 8-4-4 and it says to use it 2x per week at full strength (1 Tbsp per gallon). It never burns my tomatoes.
But, are these tomatoes in the ground or in containers? Are they full grown, large tomato plants or what?
Extenuating circumstances like that (plus) determine whether the recommended dosage of a fertilizer, on top of that which is already in the soil, could potentially add up to too much. While organic nutrients are typically more forgiving, overdose is still a possibility.
Even if your plant exhibits no symptoms of burn, that doesn't mean it is actually utilizing all that you are feeding it. Microbes in soil will also consume nutrients, but most of that will come back to plant later.
In the case of those who have the likes of mycorrhizal fungi living in their soil, nutrient doses can potentially be cut back even more... especially when it comes to phosphorous. The myco work extra hard to provide the roots with phosphorous, they don't like it present in copious amounts.