The impacts of your chipped up pine will be temporary to the established pH level that naturally exists in your soil type. What may be more important is understanding that while the chips are being decomposed by the soil organisms, there may be a loss of available nutrients to whatever is planted in the same location. This is not long lasting and you can offset this with applications of organic matter or inorganic sources. Service berries make a great large shrub small ornamental tree and several features that make it desirable. The concern with flowering dogwoods is typically winter hardiness. Lentago Viburnum would also be a choice for your consideration. A larger plant with great blooms and a berry that wildlife enjoy.