Ranked Promo Problems

(I had no idea where to put this so i dropped it here)

Hi guys, im currently silver 1 after 40 ranked games and have failed my gold 5 promos twice today. In the first set i won the first game and then lost three in a row. This was mostly due to 2 afks, a troll feeder, and a gragas who gave 2 kills before minions spawned. I brushed it off as bad luck, and got put straight back into my promos again the next game. Again I won the first one then lost the next three in a row, but this time around it wasn't just my team doing horribly, it was me as well.

My problem is i'm always matched against people who are gold 3 or higher, with most being gold 2 -plat 5. I have a few friends in plat who say im pretty much on that level with a select few champions (like zed, syndra, lee sin, and one or two others), but am only high silver/low gold with pretty much everything else. Whatever determines MMR seems to think that because I do so well with those few champions that i belong in high gold (i figured this because im gaining about 25-30 lp per win and losing only 10-15 for a loss).

But the champions I'm good at are all horribly out of meta and are very hard to win with at the minute, regardles of my personal score, so i tend to avoid picking them in ranked. This leaves me with my second rate champs like lux, orianna, and shyvanna which i simply can't play at the level im being matched with, leaving me with very average or sub-par scorelines and often being shouted at by team mates for not being up to scratch. I pick these champs because i feel in solo que its better to pick meta champs that team mates can work with easier. Zed for example is very hard to build a team around atm and most solo que players just wont change their picks to suit having a zed on their team.

So thats my dilemma. Should i play the champions i feel i can hold my own with against high golds, risking having a bad team composition and not contributing much to my team. Or should i continue to play more meta champs that benefit my team more but that im kind of sub-par on?

I know this was a long post, if you've gotten this far thank you :)