Write a business letter :

we are working with the company A , they spread 5 of our successful products. We are preparing for the release of two new promising products, and now the best time to gently ask them about the possibility of increasing our commission. At the same time, the standard conditions for all the other partners (20% of sales), and asking for more, so ask for exceptions. Competition in the market is hard and all the time there are new partners. The company A is known for its firm stance on the Commission openly states that it is standard for all partners, though there is a reason to believe that the exception is still being made, and it is likely that we have just reached the level to merit such an exemption.