How Do I Get Good As Vi Again?

• Bought back in December/January
• Placed at the bottom of Bronze 5 in Placements, largely based off being the bottom of Bronze 4 in Season 4
• Won my way to Promos for Bronze 2
• Then losing streak my way back to the middle of Bronze 4

Lost the last four games as Vi. Last match as her in Normal: http://matchhistory.na.leagueoflegends.com/en/#match-details/NA1/1807213586/203289894?tab=overview

About Me as Vi:

• R>Q>E>W or R>Q>W>E
• AS marks, AD quints, Armor Seals, MR Glyphs (recently switched to Scaling MR from Flat)
• 21/9/0 masteries
• Stalker's Blade w/ Warr (recently also trying Cinderhulk, because the friggin tank meta) - either a damage item (usually try to build/rush TF every time) or more tank. Final build tends to incorporate Banshee's Veil and Randuin's/Frozen Heart, more armor/HP/MR, 1-2 damage items potentially including the jg item if Warr
• Tries farming for core items, ganking when I can (see below), stealing dragon when I can and if doing so will not put me in a 1v2-5, wards, tries focusing on objectives

About Me As A Player:

• Practices by playing normals; not too interested in chaining customs or bots, since I see nothing to actually win
• Probably tilts way too much; one loss in any mode usually gets me upset with myself
• Focuses more on personal errors than on team member performance; raging at the team does nothing
• Frequent ward-planter by habit
• As a jg, only ganks if near the lane and if doing so will not put me under the enemy turret, or if doing so will not put me as risk of feeding, or if the ally is there to benefit. Otherwise tries to finish core items via farming or assassin-style ganks on very low-health people
• In retrospect, has trouble properly balancing between putting pressure on the map and keeping myself even
• Tends to mute everyone to prevent being affected by possible toxicity, or being called a dumbfuck for not being able to save the ally/ not ulting before I get killed/ not having Smite available to last-hit the enemy's 5th dragon. Politely tells people to slit their throats you fuckin harlots before muting them if the rage is too much.
• Not the most variable build person; tends to stick with core/general items, plus something in the late game depending on what the enemy team has (and if we even reach that point)
• Has asked for tons of help thus far, but either everyone has different viewpoints for how to play as Vi, or I may not be applying any serious "practice" styled gameplay, merely adopting the suggested items and playing Vi as usual.
• Stopped Ranked for now after dropping to the halfway mark of Bronze 4; roughly 50% win rate in Normals, 30% in Ranked according to op.gg

SO as a jungler in 5.7/5.8:

• What should I be itemizing/rune-ing/masterizing as? Stalker's or Ranger's, Warr or CH, rush TF or a tank item, what should my final build be?
• I'm basically lost as Vi currently; any other help? Or should I not play Vi competitively anymore, what with the times? Any better win-rate junglers with low ban rates (because the ... I miss her...)
• Considering some kind of tutor to supervise me playing and structuring me towards better gameplay. Clearly I can't trust myself and my mild-Asperger's-like brain to follow a guide or random posts;otherwise my win rate with her (and in general) would be climbing NOT INTERESTED in paying for services, unfortunately; also holds a full-time job with hours similar to what it was in high school (college graduate these days, for an idea of age)