i have been makpid on the shitas Hagr”a for years by Hamotzi to cut both challas, but now i see that it is getting too much monetarily to handle, as well as being that my wife and i dont eat all the challa so it most of it goes to waste. am i i mechuyav to do hataras nedarim? or since rov poskim hold its a chumra be’alma i dont have to?
Although it is certainly a chumra, you have to do hataras nedarim, as with every hanhaga tovah that a person practices and now wishes to give up.
[If you wish to continue to maintain the chumra, you could do so in a cost effective way by using matzos.]
Sources: Shulchan Aruch, YD 214; Mishnah Berurah 597:6.