losing against the CPU is very rare in CHF even in the highest diff unless you have a very bad luck and got double teamed by one of the tag team bosses, double K.O is an even rarer one
if you get another tie , i guess it means game over/continue screen for you? that's usually the case on fighting games
and ixa is one of the weakest riders in the game, his attacks could barely damage the non glass defense riders(like kabuto), perhaps you should use more emperor's moves more than kiva/normal form(unless you picked the castle doran groove, which sucks major balls aside from its finisher)
instant charge is only possible with grey gauge riders, press the special button after performing a combo that ends with a heavy attack, not all combos can be instant charged