Something you have to take in mind in this matchups is that you have your fafnir.
Most of the players of these characters learn very quicly what are your long pokes (mostly Stand S and 2S followed by a 6HS) but does often forget that you have the fafnir.
This FB is amasing as it extend considerably the range of order sol, and as he extend the range of order sol only as a FB, most of the players does not really think about it because this FB cannot be done as much as the 2S or S.
If you have difficulty to use the fafnir think about it this way : Order Sol have the shortest range of the game. Think of the moves as an extension of your range and not as a matter of priority or form. Wich moves go the most far ? 2S, then Stand S then... Fanir. If you have to press and cannot approach or do not want to because you already use cancels or many pressings, do Fafnir, you can touch from far away and it protects you as long as you are far away.
Do not fear the Counter once the move is launched (during the launch yes, but if you do not use the fanir at short range no problem), you will win no matter what as even if you can't combo, the opponent will be grounded.
My two only opponents are a Venom and a Testament, so you imagine I had much time to think about the range of order sol.
ANother thing : during thoses matchs ups, you HAVE to know perfectly your combos. Work very hard the Post Fafnir combo, get a chance to make a combo from any first move, and work hard too the smalls air combos started from the air (like P, P, K, Jump, K, S, Dragon).