Western Airguns FPE and ammo

Greetings all, I just got my WA Sidewinder in .30 cal. I've done some shooting with it and put around about 500 rounds through it. But I have 2 questions for y'all who have similar guns or experience with it.
1) The AOA video put out by Jared Clark says it comes factory tuned at 150 bar reg pressure and with that produces 80 FPE with 44.75gr pellets. Mine came with reg preset at 170 bar and with 44.75gr I'm only getting 80+ FPE. Did I get a bad one or does anyone have the same experience?
2) It likes most kinds of pellets. I've tried JSB 44.7/50.15, ZAN 56gr, Hades 44.75 and they're all getting a very nice jagged 0.5" hole at 35 yds. But she don't seem to like slugs. I've tried NSA 47.2gr, 61.6gr, ZANs 45.5gr, 49gr, 59gr, H&N 50gr, 54 gr, FX hybrids 44.5 but nothing seems to group satisfactorily with slugs. I have some Javelins on order but they haven't arrived. Anyone as any recommendations? I'd hate to think this is purely pellet gun for its price tag.

Thanks all!

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Sidewinders like only pellets. But they shoot them very well.

I have taken deer and coyotes with absolute efficiency with the JSB'S Hades in .30 Cal, so no need at all for slugs.

I have been hitting chicken silhouettes at 220 yards with my Sidewinder .30 Cal and JSB'S 44.7 grain.

I will check the regulator of my .30 Cal and will tell you how it is set. My Vulcan 3 gives 120 fpe with regulator at 140 bar, but is a hammer system. I'm will check my Sidewinder.

Personally I like to feel than the rifle feels well at shoot and pellet seems to fly right, more than the fps.

For example, the Panthera compact can shoot a lot of fpe in .25 Cal, but becomes very difficult to control at shot. I reduced the power until it was perfectly smooth but with adecuate speed on the pellet.
 
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Sidewinders like only pellets. But they shoot them very well.

I have taken deer and coyotes with absolute efficiency with the JSB'S Hades in .30 Cal, so no need at all for slugs.

I have been hitting chicken silhouettes at 220 yards with my Sidewinder .30 Cal and JSB'S 44.7 grain.

I will check the regulator of my .30 Cal and will tell you how it is set. My Vulcan 3 gives 120 fpe with regulator at 140 bar, but is a hammer system. I'm will check my Sidewinder.

Personally I like to feel than the rifle feels well at shoot and pellet seems to fly right, more than the fps.

For example, the Panthera compact can shoot a lot of fpe in .25 Cal, but becomes very difficult to control at shot. I reduced the power until it was perfectly smooth but with adecuate speed on the pellet.
What is your best shooting pellet .? And at what speed.?