After 2018 will you always earn 200K, or is this a one off? Is the 200K a sure thing? Do you also have a pension or defined benefit plan that will eat into your contribution room?
I'd do a little chart to help you figure out how long to draw out the RSP contributions. If you don't contribute any money to your RSP you'd have the following amount available each year.
Year Available RSP Room
2017 $50,000
2018 $64,400
2019 $90,410
To get these numbers you just add the existing room to either 18% of the previous year's income, or $26,010, whichever is lower. The max RSP room amount goes up by a small amount each year, so the 2019 amount will be slightly higher than I calculated here.