IRSOG37 was designed a bit differently that way... it had a far higher Jedi count than the other IRSOG units. The Tranoraan mission started with about 25-30 people, of which 10 were Jedi. After the casualties so far, that has been changed to around 6 jedi and about as many non-jedi. (HeySeuss, do you have precise numbers?)
Most other IRSOG units are probably supplied with far fewer Jedi... maybe 1-3 per unit, if any at all. Such small Jedi squads cannot do the same range of things a large team of them can.
We'd guess that since there weren't that many soldiers to begin with, the ship they came on (the Intruder) would not have a large complement of soldiers available for reinforcing them. The mission was after all infiltration and capture, not overwhelm and destroy. Its not the sort of mission they'd have hundreds of soldiers available for.