Most people that use plastic don't change their release and notice a change of direction when shooting at certain spares.

Plastic hooks...

By sanding your ball to 800 grit or so it will get into a roll sooner and not hook away from the 10 pin.

Wouldn't recommend this technique if you have either a viz a ball or clean polyester ball.

I understand this, actually I had a spare ball this season one of the Century 21s bowling.com was giving away, when it came it was polished I couldn't hit water if I throw it out of a boat, when it was dull I made my spares with it, that little bit of roll can kinda be a comfort zone.
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MainzerPower

I dabble with the surface to get a reaction that has a little roll and cover
a few boards.  This way I use the same release and dont get that "skid" down
the lane.  Dan hit it on the head, have a little bit of roll to cover the back
pin.

I see a lot of people toss a spare just like their strike ball, with lots of hand and revs....but I think they should just grip it and rip it like the PBA pros.

Throw it HARD, FAST & STRAIGHT.

If you put hand into the spare ball, of course it's going to skid...it's meant to go straight. But I don't use a spare ball