I agree with your assessment and comparison to the other basic plantation oils which are just anemic and have slightly weird profiles. I tried a Quintis oil recently- it has an odd almost fishy quality to the top note although it eventually settles into a reasonably characteristic heart and base.
I don't have a good source for consistent repeatable low stakes blending oil - in the past I've had good luck with things from RK sons for a little over $2 per gram but there is no batch to batch consistency (other than all of them smelling authentic and like other sandalwood oils that I have purchased from other sources), Some batches are the floral lily type, others are more musky, some have a slight rubbery facet, others are nutty but all of them are decent, burn clean with no fixed oils, and saturated and probably with 4 (?) times the impact of the fraterworks oil. I haven't purchased from this source in a few years but they maintained that quality over decades from the early base notes days until a few years ago at least so it's worth sampling.
I also have some large-ish bottles of recent Indonesian distillations that I got directly from a distiller who used to be a member here but he has moved on… these have worked nicely for blending and are well received by people who smell them; and also are down around the same price as the RK sons because I bought them in relative bulk.
Finally, not so long ago I got something at a little higher price point but still cheaper than the Fraterworks and quite a bit richer - from
@An Najwa. This particular batch has a kind of nutty aroma that I associate with Karnataka oils I've smelled in the past, I had asked if he might be able to source a more affordable sandalwood to use as a carrier and he 100% came through. At the time the price was less than half of the fraterworks oil