- SB = 70.59% { 88, 66, AQs, KsQs, AsJs, KsJs, KcJc, QsJs, KsTs, KcTc, QsTs, JsTs, JcTc, Td9d, Th9h, Ts9s }

- BB  = 29.41%  { A5o }

This is the range I would give villain on the river if he/she is playing somewhat well; with a balance of 13 value combos and 5 bluffing combos.

it is relatively difficult to decipher what villains range will look like on the river, as his 4bet range is going to be largely unknown, i.e. we don't know if he is 4betting all his AQo combos, or if he 4bets offsuit combos and calls suited combos of broadways, etc. 

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Realistically, you need to think about all the hands that you arrive at the river with in this situation, i.e what hands you 3bet and check this flop, then call turn Vs a bet of this size. 

Then you can visualise your entire river range, in order to see what section A5o falls into, i.e. low/mid/top of your range. From this knowledge you can then decide whether you will indeed be folding too much if you are folding A5o in this spot.

If this is the case, then you need to create a better strategy for your flop betting/checking range, to ensure that you will be able to take the heat from turn and river barrels with different sub sections of your range that you arrive on the river with. 

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I am pretty tired right now, and may of worded some parts of this weirdly or badly, but if you don't understand a part of what I have said, just let me know and I will try make my point clearer.

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however I do want to add that, Vs a villain that is overfolding preflop to 3bets, as in this situation I believe that 3betting A5o might not be that great of a strategy, when you are called you are likely dominated, and you only have one relevant card blocker to discourage 4bets, therefore villain will still have an abundance of Ax hands he can 4bet you with.  

Personally I would rather choose random suited hands that have less domination issues and more playability post flop Vs this player types calling range Vs a 3bet. 

Flatting and playing a pot in position with a greater SPR, should yeild a greater profit and allow you to use your edge given that the pot is smaller.