I also have experimented many setups on my 93p(18x20), please allow me to share my experiences
It is quite(very?) hot on where I'm playing (Thailand), so strings go soft/stretch, dead and notched quick!
Full Bed Poly - I really like full bed poly setup on the 93p, my goto tension is at 46/44 with a 1.20mm string, I have also tried lower tensions, but they are not my cup of tea.
RS Lyon 1.20@46/44 - Great control, excellent durability, nice feel on shots, loved this setup.
RS Lyon 1.20@42/40 - Same as above, however, the string bed feels mushy, not my cup of tea.
Yonex Poly Tour Yellow 1.20@45 - Very nice feel, soft and plush, good at first 3 hours, after that the string feels too soft and too powerful for me.
Yonex Poly Tour Yellow 1.20@46/44 - Same as above with much better durability, goto setup for hitting on an easy day or with GF.
Solinco Tour Bite 1.20@45lbs - Good control and spin, harsh my arm/wrist on off-center hits, feel dead/shot sailing after 4 hours of play.
Solinco Tour Bite 1.20@46/44 - Same as above, DESTROYED my arm/wrist on off-center hits, better durability.
Solinco Tour Bite 1.20@42/40 - Good spin, no issue with my arm/wrist, too powerful for my game.
Solinco Tour Bite Soft 1.20@46/44 - Great spin, good control lasted around 6 hours before the string goes dead, does not like the feel of shaped poly.
Solinco Confidential 2.0 (Unleased String, hexagonal - Used by Sloane Stephens?) 1.20@46/44 - Plays very similar to RS Lyon, feels okay(better than TB soft), very low power, not so good durability.
Tourna Big Red 1.25@46/44 - Very boardy, unable to play with this setup, restring right away (Maybe too high tension for a 1.25 string?)
Hybrids - I only tried several Poly/Multi hybrid setups on my 93p, Natural Gut was a no-go for me, too humid here and they are quite expensive to get one here.
The only multi I put in the cross is
Head Velocity Mlt 16g 1.30 (White), and the
tension is always @46/50lbs - My thought on 16g on the cross is that it should increase the durability of the mains.
Mains locks up very well, great setup for flat shots, super control, okay spin, very low launch angle. Feels varies on the main poly and main poly always dead/stretched before the muti cross breaks.
Solinco Confidential 2.0 1.20 - Really like this setup, nice feel, better spin than other hybrid I have tried, however the mains dead really fast.
Luxilon ALU Power 1.25 - Good Durability, Great Control, Very Poor Spin.
Solinco Tour Bite 1.20 - Still destroying my arm on off-center hits.
Stringing service is quite cheap here(compared to what I have read from this board) - cost around USD 5 if you bring your own string, so this allows me to restring quite often
I have been thinking on my future setup - a stiff 1.25 poly mains and a soft 1.20 cross.
My thought on this is that to increase durability on poly setups; I get around 12 hours playability, despite the stringing cost, strings can be quite expensive here)
Maybe a Prince Diablo Prism + Yonex Poly Tour Yellow? A nice colourful setup