I don’t eat beis yosef meat ( ie “kelber glatt”, ie beis yosef chumros but also Rema chumros) because
1.Our mesorah is like the Rema
2. We currently do Hungarian glatt which only allows 2 small ririn- treif according to beis yosef but we ashkenazim have a right to our mesorah. I asked my rav if I should be makpid on “kelber glatt” and he told me no.
The old seforim do NOT talk about modern Lubavitch, as the Rebbe went further than most chassidim with violations of the 13 ikkarim. So safeik apikorsus lechumra, and stay away. Gedolim said this, not just LMT in the Coffee Room. Ask your rabbeim and your rav. I’m not your poseik, neither is anyone else here. But you can look at the 13 ikkarim yourself, and see how the kashyes are much stronger than the teirutzim.
The Rashab may have been friendly with the litvish gedolim, but was the beginning of the breakaway from the rest of klal yisroel when he came out with the idea that learning Gemara with meforshim was for galus, and his “Tomchei temimim” talmidim should focus on “chassidus” to bring geulah instead of the gemara like Litvish yeshivas did. He also put out pamphlets saying the Litvish yeshivas were full of kefira. (This is in Making of a Gadol for those who need a source) .
This led to the “Shangai” disputes over who is a ben Torah worthy of the chaluka from Rav Kalmanowitz zt”l and Rav Aharon Kotler zt”l and who should rely on the Joint Distribution Committee. Rav Aharon kotler zt”l was also bitterly attacked by Rav YY Schneerson for meeting with various reshoim to save Jews. Rav Kotler zt”l responded with “I would bow to the Pope if it saved one nail of a Jewish child”. (A Fire in His Soul)
More on this can be found in the book of Bryan Mark Rigg, “Rescued from the Reich”
As mentioned, Chabad believes that only learning chassidus can bring the geula. And I mentioned how many gedolim hold that Chabad as kept in Crown Heights is kefira or apikorsus. So as a good “zeh neheneh vezeh neheneh” compromise, you can learn Tanya on your own. So you are bringing the geula lefi Chabad but avoiding the kefira/apikorsus of Lubavitch according to the gedolim of your mesorah.