There are many things that can contribute to a horse wanting, or needing, to put his tongue over the bit, such as:
The design features of the bit are making it painful or uncomfortable for himThe bit is the wrong size for his mouth or incorrectly fitted which makes it uncomfortable/painful for him to wearThe horse has pain in his mouth from teeth that are not comfortableThe horse may have pain in his neck that needs chiropractic/osteopathic treatmentThe rider is providing a rein-contact that is uncomfortable, restrictive, irritating, too inconsistent or painful for the horse.
If you would like us to look at your specific situation closely in order to make some suggestions, you would be welcome to do a Distance Consultation with us.  It would involve you sending some pictures, video and information to us so that we can suggest whether or not the horse-friendly design features of the BALANCE Fulmer Bit should help your horse. Similarly, we can check whether or not the Eeezy Reins would be likely to help you to offer a more acceptable rein contact when riding.