Nut low (no counterfeit protection), Top 2 pair. vs maniac. Jam?

[jedi]

Can't remember the complete details, but I had A734 from EP, and the flop comes A27.

There are 2 other players in the hand, one of which is laggish and has shown down crap. I have nut low (with no counterfeit protection) and top 2 pair. Villain bets, MP calls, I raise and it gets capped on the flop.

The turn is a King, River is a Queen. Villain leads out and I raise each time (villain just calls, a does the MP player)

Since this was only 3 handed, and I only had a lock on the low, should I not have been ramming and jamming here? My read that he was a maniac and my top 2 pair might have been good vs. an A2.