You say your estrogen level is 260. Are you sure it's not estradiol instead of estrogen because estrogen is the sum of estradiol (the strongest estrogen) + estrone (a weaker form of estrogen)? I'm assuming it is estradiol probably and since you are from Quebec (like me!), the measure is in pmol/L, so the equivalent of 71 pg/ml (divide by 3.671) for American readers. This level is typical of early or late cycle in ciswomen but the levels can range from as low as 20 to up to 640 pg/ml. Any number within that range is female! And pregnant women have levels as high as 75,000 pg/ml (or 275,000 pmol/l). You are on the low end.
At your levels, I never experienced much change so had to increase dosages orally significantly until I switched to injections where I feel and look better. I gained lots of weight, from a low 140 lbs at 5'6-5'7 (I was too skinny, especially in my face) to up to 160-165. The increased estrogen helped, it was obvious. I look more feminine, younger, have a rounder, fuller face, a BUTT!, more areola/nipple definition, etc. It sounds to me like perhaps the lack of estrogen is responsible for lack of weight gain/fat. Estradiol increases fat deposition in thighs, butt, breast, face, etc.
My latest level was around 2,500 pg/ml (9,000 pmol/L), typical of early pregnancy levels but started seeing changes at probably much lower levels but definitely higher than 200-300 pg/ml (700-1,000 pmol/L). These levels have not been shown to increase health risks, in fact quite the opposite, confirmed by various observations and studies. I have two endocrinologists (among them, a graduate from Cambridge and the other, an author of a book on female hormones) and a family doctor who are overseeing my treatment. BUT, each of us is so different on so many levels that we will react differently to similar levels.
Armed with this information, you can go see your doctor and ask if perhaps if a higher level (hence, dosage) could produce and be tried for better results or perhaps, if you switched to injections. I'm not a doctor but based on experience alone, I speculate your levels are too low for you. You need to confirm this with your doctor and only your doctor, work together to find what regimen best works for YOU.
Carbs also increase fat deposition as well due to the fact that they increase insulin, this is well-known by endocrinologists. Too much, however, can be harmful to one's health.
Good luck!