There might have been some that were a bit better than others but I could definitely have been a title contender 120 years ago.
Perhaps you could. Back then, the main requirement was money. If you could put up enough money to play Steinitz or Lasker (who had defeated Steinitz in 1894) for the title, he may well have played you. You would have gotten your tail handed to you though.
Hastings, 1895 was the big event of that year. Most of the best players in the world played that tournament, won by Pillsbury. The best games from that tournament are some of the best games ever. James Mason, who finished 13/22, was probably about expert strength by today's standards. But the top 5 were close to GM strength.
Lasker had defeated Steinitz in 1894, and had played at about 2470 strength. Do you really think you're +2400 strength?
Although there were chess grand masters in the 1700's -1900 they cannot be compared to any GM today.
They were not bad for their day but looking at some of their games I believe they are not much stronger than about 1800-1900 max today.
Would this be an accurate estimate?
I mostly agree with you. I would rule out Philidor, Morphy, Steinitz and Lasker, though. Especially Lasker.
Then again one has to remember that only with Steinitz started a more systemic understanding of chess. Up to Steinitz, there was the Romantic era of chess, where players just wanted to play wild combinations and sacrifices to checkmate the oposite king. It was Steinitz, who with his superior understanding of chess (for that time) who smoked his oposition and showed that there was more to chess than just wild crazy ass sacrifices and combinations.