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I dont think you will have an issue with upper magnification limit from a contrast point of view but you will have more thermals in the air from nearby neat sources (eg. roofs, paths etc).
Note with the Radian you will be losing true field for the same magnification. eg. Your 9mm Nagler (12.4mm field stop diameter) will give 1.2deg at 67x and an 8mm Radian (8.3mm fsd) will give 0.8deg at 75x. A 6mm Radian (6.3mm fsd) will give 0.6deg at 100x and will just fit the full solar disk. A 5mm Nagler (7mm fsd) will give 0.67deg at 120x. Either will give a nice view of the Sun and any flares with a little room to spare. A 7mm Nagler (9.7mm fsd) will give 0.93deg at 86x and may be a good alternative.
The Radians are very comfortable eyepieces to use with their 20mm eye relief and if your prefer the longer eye relief then they are a good choice. Note if you want to see the full solar disk don't choose a size too close to the true size of the Sun (0.5deg). Even 0.6deg is a little close since it only takes a small misalignment of your mount and you are constantly nudging the telescope to keep the object centred. It is for this reason I prefer 0.7 to 0.8deg for full disk solar or lumar viewing.
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