Silver Bullets gains far too little time per cast to be worth maxing. You get 30 seconds at level 5 which is what you need for 100% up time, it is super tedious so you might consider going for more to make it less ■■■■, but level 15 is only 60 seconds, you’re casting the skill half as many times, for 10 points. That’s not worth it, it sucks that this move is so tedious but if you’re not SR, don’t max it.
As for Tracer Bullet level 1 is 12% Accuracy with 75% up time, you can’t make the duration longer and even if you do max it you only get 30%. You’ve already got more than 1/3 of the accuracy at level 1. There is no Enhance. If you really value accuracy that much that you would ever consider more than 1 point in this, just get Enchanter, it offers so much as a class, in the future it will require lvl 5 for a crit attribute and When maxed it is 40% with an Enhance for 5 minutes. 100% up time.