Getting sick of playing against TEC. Spamming novalith cannon so I have to build starbases in every system, then coming in with a few cheap ogrov cruisers to destroy a fully upgraded starbase in 30 seconds. I can't even get a fleet from a neighboring system to make one jump before the starbase is trash. Seems all the fun and strategy from entrenchment is gone now. It should be about fleets with complements of different supporting ships battling it out, not superweapons double-shotting my capitol so no amount of upgrades can save it. Not one cheap type of ship for one faction being able to take out the most powerful starbases in the game by sitting out of range and hurling dozens of missiles. Either make them fire slower, or decrease their range to give the base a fighting chance. The only defense is fleets or squadrons, but it takes a ton of squadrons to take them out fast enough. No other faction has such a great anti starbase weapon. I'm not usually one for nerfs, but all AI settings being equal, Vasaari and Advent are cake compared to TEC. The playstyle in rebellion just isn;t as fun, as much as I like titans, the AIs use of the novalith and the overwhelming attack of the ogrov make the playstyle less strategic and fun, and more tedious and frustrating.
Based on your description it sounds like your playing as the advent with this problem. Because if you were vasari, you could one jump back with phase stabilizers and their starbase will close that distance negating the range advantage. I agree the advent need some buffs, but there are a couple things you can do as advent to minimize the damage. For one you should put the "Enduring Devotion" upgrade on all of your advent starbase (Auxiliary government for TEC, and Enforced Loyalty for Vasari) as this will completely eliminate the loss of your planets to novaliths. You will still take a small, but temporary hit to credits, because it effectively kills the planet, but you will not lose the planet and it will rebuild without you having to recolonize it. This is especially important in rebellion given the TEC loyalists heavy use of novaliths. As for the ogrovs. As the advent you get a research bonus allowing the building of more defense structures when compared to the other factions. Use this advantage. Do not build tons of turrets. Focus mainly on hangar bays with bombers. En mass they have more firepower than turrets, are more versatile, have excellent range and should help negate the range advantage of ogrovs. Make sure to beef up the defense of your starbases hitpoints and increase it's firepower. Combining these tactics, you effectively negate the range advantage of anti-structure units and you force any opposing enemy fleet to take on your starbase head on, because they can't kill your planets without first taking out the starbase. Forcing the enemy to fight on your terms and if done correctly should give the rest of your fleet time to make it back to reinforce the system.
Hope this helps.