I never found information on the TST Brigadiers, but I wasn't looking for that. Some of the company Muster Rolls can be found online and downloaded from the Texas State Library and Archives. My great great grandfather served two 6 month enlistments. The first (Aug 1863 to Feb 1864) was in Company A, 1st Regiment Cavalry, 28th Brigade TST. The second was in Company G, 4th Regiment Calvary, 2nd Brigade (Mar 1864 to Aug 1863). During the first enlistment, my ancestor was stationed in Galveston to patrol the west end of the island in case the Federal army tried to invade the island . While at Galveston, the TSTs were under command of CSA high command. When the threat of invasion on the Gulf Coast receded, they were released back to the state. During the second enlistment the regiment was staged in NE Texas in case the Red River Campaign was successful and the Feds decided to invade Texas from Shreveport.
The following information was found online:
The position of adjutant general was established by the Militia Law of February 14, 1860, which to assume the duties of quartermaster general and ordnance officer of the state.
With the Civil War came the reorganization of the state adjutant general’s office by creating an adjutant and inspector general, who would also serve as quartermaster and commissary general and ordnance officer.
Oversight of the 33 brigades of the Texas State Troops, the Frontier Regiment, militia, and the Rangers (whatever the prevailing terminology) fell to this office.
The manpower and supply demands of the Confederate States Army, often conflicted with the needs and desires of the State of Texas for the entire period of the war
The Texas Adjutant General's Department created and maintained information on various brigades of the Texas State Troops. These records consist of nineteen items providing general information on brigades of the Texas State Troops, 1861-1863 and undated. The first group, all oversized, includes the following: an "Organization of the Texas State Militia" to November 23, 1861, listing the numbers of officers and men for each brigade; an abstract of troops reported to the adjutant general under an act of December 25, 1861; a list of companies reported under the governor's proclamation [1861]; a list of captains in the Frontier Regiment, with company letter and station (April 21, 1862); a list entitled "Information in regard to different brigades collated from correspondence in the office of the Adjutant and Inspector General" (about March 1863), that lists brigades, counties, camps, number of men called for, brigadier general, post office, colonels, adjutant and inspector generals, and remarks; a list of companies raised in the different brigades of State Troops, with the date of their transfer to the Confederate States service (1863); and appointments of ordnance officers, matched with their counties and brigades (undated).
The second group includes: an "Abstract of Adjutant General Report" [1861]; a list of counties corresponding to the brigades; a partial list of brigadier generals with dates of their commissions (ca. September 1862); a register of resignations of Texas officers in Confederate States service, with name, rank, corps, and date of acceptance (1862-1863); a typescript list of Brigadier Generals of the Texas State Troops, with name, number of brigade, and counties composing the brigade (1864); a tabular statement showing the strength of the Texas State Troops, by rank (undated)
Geographical list of Texas State Troops, 1861-1865:
COUNTY BRIGADE
Bosque 28th
Brown 28th
Callahan 28th
Coleman 28th
Comanche 28th
Coryell 28th
Eastland 28th
Falls 28th
Grimes 17th
Hamilton 28th
Harrison 6th
Hill 28th
McLennan 28th
Montgomery 17th
Runnels 28th
Taylor 28th
Upshur 6th
Walker 17th
Chambers 2nd
Hardin 2nd
Jasper 2nd
Jefferson 2nd
Liberty 2nd
Newton 2nd
Orange 2nd
Polk 2nd
Tyler 2nd
Note: These are the only four brigades I was interested in for a power point program I made for SCV camps.
This did not exactly answer your question, but maybe it will help.