What tension differential do you all recommend in a gut / poly hybrid setup?

Most ATP players seem to string 2-4 lbs higher on the gut mains than the poly crosses, but they also switch to fresh strings before the poly loses much tension.

I've been using a 2 lbs differential (mains Babolat VS Touch 17 @ 53 lbs x crosses Luxilon 4G Soft 1.25 @ 51 lbs in a 18x20 pattern) and love it! but looking to further improve that setup.

What puzzles me is that once the poly loses tension the differential gets much bigger than the original 2 lbs.

Using RacquetTune, on fresh strings I consistently get the average between 53 lbs and 51 lbs: 52 lbs, which looks just about right.

The next day I typically get 50 lbs, so assuming the gut is only 1 lb down to 52 lbs (from prior experience with full gut) that places the poly around 48 lbs: a 4 lb differential.

After a few days things eventually stabilize at 48 lbs and I'm pretty sure the gut is still at 52 lbs, placing the poly at 44 lbs: now a 8 lb differential, isn't that too much then ?!

So I'm wondering if we (normal players, not getting fresh strings as often as the pros) would benefit from stringing the poly at the same tension as the gut to help minimize the differential once it loses tension...

Thoughts?