If anyone needs engine space its the Klingons.
Rom tactic's tend to lean towards the cloak and alpha strike. Generally engines ,while always useful, are not super important in this case.
For Roms its all about cloak and weapons. After thinking about it I think Rom's do not need more weapon mass. What they need is better weapons to use that mass. Rom disruptors and plasma are crap. Sorta leaves the Rom with few choices hey?
Make all Rom disruptors do more damage and have higher recycle times and lower plasma mass. Do not give a Warbird a new rear hard point give them another forward. You know there is something wrong when a Defiant has more heavy heardpoints then your DN.
Cloak de-cloak is faster. Cloaking speed the same. Make surprise attacks a real surprise but also make Rom (Kling) players put a bit more effort into the getaway.
Even with cloak/alpha Rom's take a big risk (which crap armour and all) the least you could do is give them the best alphas.