It has been noted on the WhatsApp forum that Long Spear suffer a bit in Magna due in part to UG sizes (long spear mostly in 4's).
A completely unofficial change for Magna games would be to allow Long Spear factors to count in 1 rank. If implementing this change I would recommend that Long Spear only cancel mounted charge combat preferred claims if they are in 2 ranks (a bit like Shieldwall currently).
This follows on from the comment about Long Spear earlier in this forum.
Richard