I'm glad that you're clear on what makes this list fun for you. I will not suggest that you do anything else with your elites points. As far as I know, there's nothing wrong or foolish about building your list around an elite core that can smash everything in its path. However, if the core of your army is so... direct, the rest of it needs to take care of the triksy.
Here are a couple of potential suggestions:
1) Trade one or two of your vindicators for dakka or las predators. If you like vindicators, feel free to keep one.
2) Trade in one of the tac/rhino squads for a devastator squad.
3) Turn one of the rhinos into a razorback. Lasbacks and las/plasbacks are popular, but even the standard heavy bolter has a 36' range and gets **** killed.
4) Put one of your tac squads in a drop pod.
5) Put Lysander and company in a standard land raider rather than one of the close-range variants - then it can double as anti-tank as it trundles towards enemy lines.
6) Trade in a tac squad or two for scouts who can infiltrate or outflank as the situation requires it. Scouts with sniper rifles are very killy. Scouts with a missile launcher pack a nasty and surprising punch.
7) Try adding landspeeders (personally, I prefer Typhoons - the long range combines well with their speed to let them attack enemy vehicles and heavy infantry without fear of reprisal). Potentially, put your scouts in a land speeder storm.