Scott,
Perhaps it may be helpful to unpack the way we use "gospel" a little more. The doctrines of grace are good news for sure. In fact, the whole counsel of God is good news. However, I would not say that it is the gospel as scripture defines it, at least in a sense. Similarly, the doctrine of election is not "the gospel" as it goes out to unbelievers, which is normally how we use the term. Consider Dort 1.14:
"As the doctrine of divine election by the most wise counsel of God was declared by the prophets, by Christ Himself, and by the apostles, and is clearly revealed in the Scriptures both of the Old and the New Testament, so it is still to be published in due time and place in the Church of God, for which it was peculiarly designed, provided it be done with reverence, in the spirit of discretion and piety, for the glory of God’s most holy Name, and for enlivening and comforting His people, without vainly attempting to investigate the sacred ways of the Most High (Acts 20:27; Rom. 11:33, 34; 12:3; Heb. 6:17–18)."
This is important since while the gospel is fit for an unbelieving world, election, as a part of the doctrines of grace, is fit for believers.
Similarly, the 39 Articles, Art. 17 states:
"As the godly consideration of Predestination, and our Election in Christ, is full of sweet, pleasant, and unspeakable comfort to godly persons, and such as feel in themselves the working of the Spirit of Christ, mortifying the works of the flesh... So, for curious and carnal persons, lacking the Spirit of Christ, to have continually before their eyes the sentence of God's Predestination, is a most dangerous downfall, whereby the Devil doth thrust them either into desperation, or into wretchlessness of most unclean living, no less perilous than desperation."
This confirms something similar to Dort while speaking of the danger of holding this doctrine before unbelievers. But certainly the gospel should be held out before unbelievers as Dort also affirms in 1.3-4.
All this to say, our confessions do seem to distinguish "the gospel" and the doctrines of grace insofar as what is to be proclaimed to whom.
I do believe that the doctrines of grace are good news (gospel) for the church militant in their present salvation (those who are being saved).