Your build is absolutely fine and won't hinder you from winning games in silver elo.
After taking a look at your opgg, I would suggest focusing on improving your cs/m and minimizing deaths.
That being said, target dummy dps does not really tell the whole story.
In some games where you are against an armor-heavy enemy team, buying collector will delay the point where you can actually deal significant damage to the enemy frontline.
As for Infinity Edge, it certainly has its value, but in some games you might find that you need the extra mobility that galeforce provides since you will be dealing 0 dmg when dead or zoned.
Obviously, if you are not yet comfortable using galeforce then IE will be better in every game.
Generally speaking, you want to roam when the wave is pushing towards you. Having the wave push towards you means that your ADC will lose few to no creep while you roam.
One common roam timer is after you and your ADC crash the wave into the enemy bot turret and recall, you can walk mid to look for a gank or countergank. If there is no opportunity, just walk from midlane back to bot, since the enemy could stack waves via slow push and dive your ADC if you stay away too long.
Do not roam when the wave is slow pushing towards the enemy tower, that's when your ADC can get zoned off all farm and xp.