The point of CI Infil is to basically gather info, be a double agent and be useful for the Delta, Shocks and Operatives before they decide to attack the Foundation, you're given shit weapons for that reason, not to mention MC&D exists so you can buy some nice guns to make you better at combat. Each Infil has their own raid timer from what I remember, so they can basically plan and do whatever the hell they want without the main strike force interrupting them.
How about making your objective meaningful rather than wasting by basically doing a fuck all shoot em up scenario, make your own RP, try something new rather than doing the same thing over and over and over. Disguises exist for a reason, and a nice one is Researcher and Field Agent (If you're not retarded with the disguise that is).
Yes getting into the site is already a nightmare, but if you do get in, don't ruin the chance.
The amount of RP you can do with Researcher and Field Agent is fucking amazing but no ones really taking advantage of it. Take for example when this mofo "Richgun" or the CI Main that called himself "The Archivist" don't really remember his fucking name, we did stuff that basically was the purpose of CI by creating chaos and scare the living fuck out of Foundation, an example of this is basically making a fake ORIA threat in the city and combining the use of grenades and other nice cheeky shit. https://docs.google.com/document/d/1id9G12LhM5ruj1ddkqbXaA1i--UTIHksFeXZoDCu6oI/edit?usp=sharing
The point is, you're a not entirely a combat unit, think of it as GOC Assessment Team, you gather info, do your own thing that won't compromise you, help your mates when they need you, make your own RP and have fun.
Don't give yourself brain damage.