"Only reinforcement is Scimitar" -- Are you talking about on Defense, so that Scimitar is definitely going to be the first reinforcement?
No one wants that. We want the defense to deliberately play with sub-optimal strategy so that on offence people can move up for their payout. And that's exactly what this allows. I've never lost using Scimitar as the first reinforcement whether or not my hangars were sabotaged first.
If they are, then Scimitar dies, but it's the reinforcement ability that makes the difference. If the hangars are not sabotaged, then I stealth everyone but the tank. Either way my next move is to sabotage hangars and then I bring out the Mk6 Interceptor next time, insta kill their tank and win.
Are you choosing not to bring in Scimitar during your first reinforcement turn b/c you want to sabotage their hangars? That's not the optimal play. Get Scimitar out as early as possible so that your speed advantage can allow you to lap the enemy ship as soon as possible. I think you'd still win bringing out Scimitar on turn 3, but I know I always win bringing out Scimitar on turn 2.
The Scimitar change has been perfect. Scimitar is an underpowered ship and it's not going to make a difference most times, but it does a great job of ending the coin flip problems with Levi.