Batch Process NEF/DNG Files

The "standard" workflow approach would be to open all 150 files into Adobe Camera Raw. Then apply the required develop settings on a representative file. Then select all files in the "filmstrip" and sync settings to the other 149 files. Then press the save images button to render out the modifications to a final JPEG file. All of this is performed in the raw converter without opening the files into Photoshop.

Have you tried using the Image Processor Script to batch your Raw files and have it include an action you supply in its processing. It has a RAW option that you can use to have it open ACR dialog on the first image where you set the set the conversion setting. Then script will the use those settings for the rest of the batch.  You do not have to use that option. If you do not. The script will just have  ACR use its defaults or the setting you has set previously the the raw files in the batch. I woul thing a Camet imags save as a 8Bit Jpeg quality 10 will be under 30MB.. It would need to be extreanly Noise ot detailse to be ovet 30MB and you action or ACR setting are addressin noise.