I have seen this map before, at the Richmond Battlefield Website. Thanks for posting this scenario. That said, this was NOT the final Union Position, but the second major position, the Final one takes place outside of Richmond at the graveyard. The first position is by Mt. Zion Church. The first position was manned by Mason's Brigade. Nelson was the Division Commander, but was not present until his arrive and rally of the Federal Troops at the Final Position near the town of Richmond Ky.. Also the Federal Troops were in large numbers, and to reflect this you may consider making Cruft's troops in blocks of 6 to 8 covering two hexes instead of one. They would still fight with 4 or less dice based on losses, but hold more ground, and be more steady than Mason's which by this time had been bled some in the early fight near Mt. Zion Church.
Just another note. This position straddles the Kingston Rd. south of Richmond. It as this road that Confederate troops used to advance on Richmond. The federal position had the high ground with good view of the Confederates. They also had use of a split rail fence running along the Federal right. The Confederates flanked the Federals along their left using the woods. I have visited this field many times over the years.
You have to keep jn mind that the number of units in a CC scenario represents both quality and numbers of troops. For example, in the Antietam and Fredricksburg scenarios the AotP was twice the size of the AoNV (and even if you just count troops engaged, had about a 3:2 advantage), but in both scenarios in BC150 the sides have rough numerical parity. Given the poor Union performance at Richmond, I think from a historical perspective it is hard to argue the Union need more troops.
That said, it might help from a balance perspective. This is along the lines of "No Hope Church" in being very difficult for the Union to win.
Vittoria Unione 6-3. Mentre i confederati avanzano i nordisti portano in posizione la loro artiglieria. I sudisti danno inizio alle ostilità sulla loro destra cercando di eliminare la batteria di artiglieria che al contrario si difende bene eliminando due unità sudiste prima di retrocedere sulla collina. I confederati spostano l'azione sull'altra ala dove la fanteria al comando di Churchill riesce a sfondare la linea yankee anche se al costo della vita del generale stesso. Il centro nordista concentra il fuoco sulle ali eliminando le poche unità sudiste che erano riuscite ad arrivare a tiro.