Of course! Keep adding compost--the balm that heals the earth.

And I would say own-root roses may take a while to get going--especially in zone 5b/6--it may take somewhat longer than expected, but the area can come back and be fertile again.

Are there any other issues, such as poor drainage, that need to be addressed?

Hoovb, No drainage problems. The tree held the ground firm for so long our yard is higher then the surrounding yards.I'll just have to keep at it.

Did you dig out the tree roots? I have been planting roses where pine trees used to grow--the roses have been doing great! I think a lot of my success is proper preparation--taking the time to dig out the roots and not planting roses between the roots. Last time I used my wife's cordless reciprocating saw--made it a lot easier.

Sounds like it may be overexposure to peat moss. Adding compost will help to dilute it and improve the situation.