One thing that will save your hull is making sure you have the bow eye bolt completely up and against the bow roller before trailering. I have not found that I can get it completely snug without leaving "some" power on the engines while I tighten the winch. If you don't have it completely against it, and then tighten the transom straps completely, the boat bottom gets scuffed on the carpet where you can't see it when loaded...this is with or without soft bunks, liquid rollers, or anything. About the only thing I know that prevents this is keeping the boat from moving. If you have an MFI trailer on an older boat, and don't have a bow stop post weld or bolt mod, your boat moves EVEN if you follow the above procedure...so you should modify the post to prevent the movement. The Shorelandr trailer post is solid and doesn't flex like the MFI.
@scokill is on the money, wet the bunks first...even maybe put it under completely and pull up and back several times occasionally to rinse them. If you can, use a brush occasionally on them to get the sand out. I too back deeper, to float the boat first, then pull up to launch depth. It makes a BIG difference. I do not winch my boat to the stop. I have the stock winch and did on the previous boat, and never saw a need to winch as it just doesn't do any underwater damage to pcowerload...the pumps are jetting on top of the water, not down on the ramp under the water like an I/O would do. It looks and sounds bad, but your just surface splashing. If you have two people to load and crank, it goes fast, 10 seconds maybe...if you alone, like me, it takes maybe 20 seconds, to walk to the front with the power still up, and winch tight, and then go power down.
One more thing, if you find after you pull out, that you didn't get the boat snug up and under the bow roller, you can do a hard stop (be careful with this), to scoot the boat's bow eye up and under the bow stop roller, then winch tight again, and tighten the transom straps. Even with getting it tight, when the straps dry, they can either tighten or stretch, and i'll be damned if I can guess correctly. So at the first stop I check them again. When I load correctly, they always stay tight.