I can't say for sure without checking your inventory, but that seems the right move.
Stay away from RP explosives for the time being. They are good, but incredibly expensive, and you can boost your stats a long, long way with other RP items before these should be a focus.
The M1A1 is the tank (vehicle) with 70-odd atk.
You have a few things going for you. Firstly, syndicates will be able to give you very large % stat boosts. Secondly, if you camp out for a while then the scratchers should actually help, a little.
Make smart use of open-10s (bosses too, but you will be quite hamstrung at top-tier with your stats) - use low-XP trigger events (robbing laundromats, essentially) and you can accumulate some fairly decent weapons that will also help. Even if you don't get the 10th item, the open-10s are giving you 4 quite reasonable stat items for free.
