I notice the germinating seeds are well down in a part filled pot. There is more risk of fungal infection that way because air does not circulate well in part filled pots. Much better to almost fill the pots to allow seedlings access to fresh, moving air. If you are worried about soil depth or amount of soil required use flatter trays or cut the pots down.
It is fun to watch the roots develop in damp paper but untangling the roots from the paper can be tricky when planting them in soil later. Better to skip the paper and plant seed direct into soil.
When transplanting those paper germinating seedlings you may like to try cutting some of the roots. Sounds drastic but it is something I do all the time to promote more lateral roots for later nebari. Seedlings cope with root pruning really well so I can snip of 3/4 or more of an emerging root with very little setback in growth.