Ok, make the core of the plant a little hotter, say by 500K, to make sure :
- the outer core thick-ish and mobile and generating a strong enough magnetic field and the inner core still small
- the mantle is fluid enough to allow some dynamics
- the crust stays around 20-25km on the continental side
1.5R means 2.25 larger surface to radiate inner heat, so lets make sure we have enough of it to start with
Last two bullets should ensure you still have tectonics without running-amok vulcanism.
For a good measure, place an order for asteroids with everything Earth has in terms of the concentration of surface available elements and primary substances after the crust was formed - me thinks you'll need a wee more than twice the amount that Earth used.
Water is important enough for the fluidity of the mantle and to encourage the subduction by providing some lubrication, so make sure you order enough of it to have some oceans as a reserve for... ummm... rainy days
Also, ask for a surplus of oxygen. Not much, perhaps 5-10% will suffice, you'll see a bit later why.
At 10-15% extra gravity:
- if you planned well the volatiles, you'll have your atmosphere a bit thinner than Earth's at maybe an slightly increased pressure at sea level, but not enough to mess the radiative absorption/rejection/cooling-at-night-time or to increase the eolian erosion.
- the maximum height of the mountains will be lower than the same on Earth, because at equal compressive strength of the rocks, a higher gravity means the rocks will crumble at lower max height. But even Earth doesn't have mountains to the max of allowed by the compressive strength of the rocks, so you can still have a Himalayan range.
- besides, with a continental crust about the same as Earth, those mountains (and glaciers) will push the crust about the same depth into the mantle; after all, is a matter of buoyancy, thus independent of gravitational intensity, so pretty much the same isostasy that you see on Earth
Ok. now we get to the need of enough magnetic field, even when diluted in a larger volume and the need of a bit extra oxygen. You see, that:
Star : 506% Sun luminosity, 134% Sun diameter
buggered me. While you took the pain to get the same radiance per unit of surface on the planet (at 2.25AU), you needed to pump up the star's radiation power but could not afford to increase its size. As such, the power increased by a factor of 5, but the "reaction" volume increased only by 1.343 = 2.4 and the radiative surface by 1.342 = 1.8. Stefan-Bolzmann law says that the temperature of your star is about 7500k and Wien's law says peak emission happens at 390nm - which is near-UV. Your star is a F-type main sequence and the habitability in Terran terms requires UV shielding. One on top of the other, you will need to:
- use some oxygen to make ozone and keep it well inside the Van Allen belts
- make sure you have enough magnetic field to sustain those belts against the stellar wind
- never ever let the sapiens species there use (H)CFC for their refrigeration needs
With all that, you should have a planet as good as Earth, just a bit larger.
