Help with going from unranked to ranked TT

Hello, This is my first post (if this isn't the right place I'm sorry).

Background: I'm fairly new to LoL (5 months of play time). I'm at full mastery lvl and I play support and jungle all the time. I'm starting off my 10 pre-rank games (6/10).

Problem: I love playing Twisted Treeline unranked. I'm pretty good and frequently get "s" ranks in them. I played my first ranked TT last night and I was smoked (1/8/1 with a lose) I played jg Shyv (tank build). The other team was good at sending in their Ashe as bait and would frequently gank me from the bushes when I dove. My other teammates consisted of Lux and Graves. A few deaths in I realized they were playing passive and would play far back and frequently return to buy items. The Graves didn't like me entering his lane (I guess I was interrupting his flow even when the minions were attacking his tower with add pressure from champs). I suppose I should have played more passively, but I found it tough to wait for the right time to dive when our towers were pressed and our team was out of sink with my dives (lack of communication from me I guess). I accept a lot of blame for the lose, but my team ended up breaking code and swearing at me and saying they were going to report me for feeding. I didn't report them (one was on a promo and I felt a little bad for playing bad).

My question is this: How do play better at Twisted Treeline ranked? What should I practice in TT unranked (such a garbage fest with all the bots and random play though)? I like to play Irelia and Shyv. What should the ranked laning phases look like in ranked TT? I really don't want to wreck someones promo again or get berated (was up all night thinking about it).

Thank you for all responses.