Aftermarket reeds should have the oem reedstops off, too. If you have just metal strips where the mounting screws are, chances are you have aftermarket reeds, cuz that's where those metal pieces would come from.
If you still have the large, heavy, spoonlike limiters......they are either still oem, or the 'turkey in the corn' didn't put the aftermarkets reeds on right in the first place.
Doesn't matter. If the bike is new to you, you would do yourself a big favor by replacing them anyway.
re: other things that help bottom end
A KIPS that works
Proper jetting (BIG time!)
12T CS sprocket
Correct sag/shock compression clickers (application of power)
A mototassinari deltaforceII reed cage.
Use a good premix oil.
Torque ring (increase headpipe length)
Reedblock spacer
-35 FmF pipe
RB carb
Spacer thing? What's that? You're talking about a hemholtz resonator cover spacer? That's on the LH side. I don't think that's what you're talking about, cuz that is the opposite side from the KIPS activation shaft.
In any case, a hemholtz cover spacer will change the power band 'location'...when it happens. It's application/use is of some disagreement.
Oh..take your suspension apart and grease it. Steering stem, too.