Personally, I be carefull experimenting out side of your ops manual/the way you where trained.
The only plus i have found with 1050, over 900, is tht if flying at higher levels the rate of climb can drop so low after 20,000. But if you start of with 1050, until it becomes limiting (fl070 - 080 ish in the uk) then come back to 900 you will have the extra speed and energy to keep the climb going.
How do you find the "Q" system, we dont have it, but i think that it is inop at 1050, and only works at 900? might be wrong.