Keep in mind, Tucker Equitation Endurance has to accommodate your leg similarly as English saddle does.
I used to have one and it did not fit me- it did not accommodate my legs and going one seat size up was not going to solve anything- I would just drown in that saddle, ha, ha.
Also, there is original model and Gen II. A lot of people prefer original models, as Gen II is so cushioned, one can hardly feel the horse at all (I got to try it in another Tucker model). It is probably great for long trail rides though. Of course, it is also a matter of preference.
If I were you, I would probably try to find a western saddle (since you already have AP- the ride is not that much different, IMO, and you can get trail stirrups for English leathers, too).
I would not go with ranch or roping saddles- those are the heavy ones (they have to be sturdy enough to hold a cow from).
I love barrel saddles and they are typically the lightest ones- it is a race after all.
Watch out about skirts. If you horse has shorter back, most square skirts will not accommodate that! If in doubt, go for a round skirt. Don’t let people tell you, long skirt does not matter, because there is no tree. It might bother your horse eventually big time!
As for Circle Y saddles- many believe the newer ones run narrow (among others, my fitter). It is my experience also. The wide tree was not wide enough for our guy. Some models come in X-wide, so, perhaps that might work.
Finally, I would suggest, stay with American made (as baffling as tree sizes might be).
ETA: You might find a good used saddle for a reasonable price.
The new ones, the good ones, however, are pricey (even more than many good English ones). I met a lot of people on the East Coast, who thought western saddles were supposed to be cheaper than English ones (probably, because they are originally work saddles, while riding English has always been really just a wonderful past time for those, who could afford it).
Good Luck with your search! (living on the East Coast, I gave up long time ago- I have much better access to quality English saddles than western ones- new or used).