Bluffing' w/ ace no kicker

Thoughts about this play would be appreciated. Villain is easy to get an read on as he always min-raise flop when he hes TPTK or better. In other situations, wether he is on a draw or holding TPWK or worse he is inclined to just call bets. Of course my assumptions need not to bet 100% accurate, but this is how he acted the last 3 hours. I think this is a great play to do against an obvious opponent, but then again opinions differ greatly.

***** Hand History for Game 3433351802 *****
$50 NL Texas Hold'em - Wednesday, January 25, 04:53:59 EDT 2006
Table Table 72973 (Real Money)
Seat 1 is the button

Total number of players : 10
Seat 1: Sciolist ( $45.50 )
Seat 2: LaCleopatra ( $28.50 )
Seat 3: messiahkid ( $128.10 )
Seat 4: Bkjoeya ( $78.52 )
Seat 5: Gnupa2 ( $83.63 )
Seat 6: preety_girl ( $51.65 )
Seat 7: nutmeg2000 ( $48 )
Seat 8: HenceTCH ( $14.25 )
Seat 10: stiff_dan ( $50 )
Seat 9: Gridlock_ ( $50 )

LaCleopatra posts small blind [$0.25].
messiahkid posts big blind [$0.50].
Gridlock_ posts big blind [$0.50].

** Dealing down cards **
Dealt to Gridlock_ [ 8s Ah ]
Bkjoeya calls [$0.50].
Gnupa2 folds.
preety_girl folds.
HenceTCH calls [$0.50].
Gridlock_ checks.
stiff_dan folds.
Sciolist calls [$0.50].
LaCleopatra calls [$0.25].
messiahkid checks.

** Dealing Flop ** [ As, Kd, Tc ]

LaCleopatra checks.
messiahkid checks.
Bkjoeya checks.
Gridlock_ bets [$2.50].
Sciolist folds.
LaCleopatra calls [$2.50].
messiahkid folds.
Bkjoeya folds.
HenceTCH folds.

** Dealing Turn ** [ Ts ]
LaCleopatra checks.
Gridlock_ bets [$8].
LaCleopatra calls [$8].

** Dealing River ** [ 7h ]
LaCleopatra checks.
Gridlock_ bets [$17.50].

By the way, the reason I call this a "bluff" (would of course be a value bet if he held something worse than an ace) is that I strongly believe opponent to have an ace with a no-kicker.

If she's a calling station with an ace and no kicker, aren't you just wasting rake? Or does she generally just chase her kicker to the river and fold if it doesn't hit (in which case a big bet from you gives you a decent pot when she folds)?

She is no doubt a calling station and is quite easy to read. Of course I could be wasting rake if she decides to call with her would-be-ace, but this is very marginal to consider when you have to believe she will at least on some percent of the occasions lay her hand down. I dont know what the calling stations actually is thinking when they decide to chase/keep honest/whatever but what I have noticed several times is that they can actally be intimidated if you keep showing strenght for three streets.