Let's look at the make-up of the zero temp, zero field boson divorce energy. It seems reasonable that there will be a large term from the electro-static repulsion offset by a much smaller term for the magnetic attraction. For a spin one boson the magnetic term repulses as well so it could never form in nil field because it would flip into a spin one.
However, as field is applied, the energy inherent in the spin zero goes up as it bends the field around it while the spin one, were it to form would gain energy from the magnetic field. Thus at some point the field causes the spin zero to flip into a spin one which, by taking a magnon(?) of field through it, then reduces the displacement energy of the spin zeroes in the area. So spin ones reduce the chance of their formation around them and, being essentially a long bar magnet they repel each other.

I would guess the crossover energy (0<->1) is about halfway between the spin 0 and spin 1 divorce energies and so is a measure of the electrostatic repulsion for that magnetic field.

If the X-over energy is above the fermi level then spin one bosons never form, which is why they aren't seen in type I SCs.

The field at which the Meissner effect stops for an HTSC at 0 K should give the X-over energy.

It may be that the way the SC region achieves the Meissner effect can be seen as it wrapping itself in spin one bosons to guide the field around it?

It seems to me that the density of vortices is important as is temperature. At low thermal excitation and low densities the vortex will try and maximize its distance from other vortices in order to gain as much energy as possible from the surrounding spin zero bosons. It seems probable that this effect has a range of a few bosons, maybe mathematical modelling v. observed photos of vortices will give us an angle on this.
A spin one surrounded by zeros is somewhat locked in place because there is an energy hump to get over for a surrounding zero boson to flip to spin one and the one to zero. As thermal excitation increases the flip becomes easier and the vortex behaviour more liquid, conversely as the field increases the density of vortices increases till most of the zeros are being affected by more than one spin one boson and the formation of another gains little energy. This effectively reduces the 'hump' and encourages exchange flipping mobility.
In generic terms I hope this fits observed vortex behaviour.