“If you think the OU is not OK, then you are saying Rav Belsky is not good enough for you”
Absolutely not. The OU themselves will gladly tell you that there is a need for their kulos for the wide tzibbur, and it makes perfect sense for an individual to be machmir. That’s besides questions of machlokes, no big chumrah, just a particular question R’ Belsky happens to hold is muta and your Rav holds is assur.