I attend a Reformed Baptist Church and although grape juice is used in our communion services, never have I have seen white grape juice served.
That said, I do know that my pastor and the leadership of our Church would actually love to start using actual wine in our communion services. However, if we did we know the consequences would not be good. Especially from the older Christians attending.
Sinse my pastor accepted the call to become our pastor around 8 years ago. The Church has slowly got more and more Reformed in its approach. This has not come without a lot of struggle. Some have left because during his expositional sermons, he did not shy away from interpreting the passage biblically. During that time, he did not say words like Calvinism, Arminianism etc. Yet it was very clear on what he believed (by the way, it was in keeping with the Churches statement of faith). Up until about 6 years ago there were 4 elders; two Arminian and two Calvinists. I was told the elder meetings were quite spirited.
We have had people leave who embraced the doctrines of grace, but because my pastor is not a Dispensationalist, they left the Church in protest saying the Bible clearly supports Dispensationalism. I found out that years ago, a pastor at our Church got fired for being A-millennial.
Just over a year ago, we changed our name to reflect better on what we believed as Church. We named it Providence Baptist Church.
I know how much this new name would wrankle some of the people that left the Church.lol
Anyway, the leadership is careful, but deliberate on the fights they choose to pick.
I can also tell you that many Sundays (especially in the Summer) where having 50 people is good attendance. That coming from a congregation that has fluctuated between 35 and 150 people in the last 7 years.
Not sure if that helped answer your question, nor do I know if this is typical in Reformed Baptist Churches.

Tom
PS, please be in prayer for my pastor and his family. Not only have they had it tough with things in the Church they have a tottler who has had poor health his whole life.