Wyandottes have the following genes for lacing.
eb/eb, Ml/Ml-Pg/Pg, Co/Co, their lacing does not extend to the tail, they have black tails(or blue tails on blue laced)
Birchen based lacing(Orps, Polish, Sebright)
ER/ER, Db/Db-Ml/Ml-Pg/Pg, Co/Co, this combination of extra melanizer(ER...
Yes, there are many variants of Slow feathering. But as far as I am aware neither Laced Orpingtons, Laced Sebrights nor Laced Polish have any type of slow feathering. But Those are Feathering based on ER Birchen which is different from the lacing found on Wyandottes.
ER/ER, Db/Db-Ml/Ml-Pg/Pg, Co/Co
Lavender Silver Laced will hardly have any contrast...
It's true, the Calculator while a very powerful tool for learning it's not perfect and to obtain perfect lacing you don't need 128 nor 256 numbers. I very much suspect that the OP should be able to see good pattern on a very good F2 Hatch...
F1s are really of no interest here. You need to hatch enough F2s to try to get Lavender Laced... So in order to increase the chance you will need to hatch alot and alot of hatching eggs would require many F1 breeding pairs
Also the Db gene is linked to Melanotic and Pg. The order of the linkage is Db-Ml-Pg. The Db gene is about 10 map units from the Ml and Ml is about 10 map units from Pg.
Lavender Sebrights have been produced before(Goole Search)
As with any genetic project you need to know the genetics behind them.
Gold Laced Sebright are: ER/ER, Ml/Ml-Pg/Pg-Db/Db, Co/Co, s+/s+, Lav+/Lav+
Self Blue OEGB, are: E/E, likely Ml/Ml, pg+/pg+, db+/db+, co+/co+, s+/s+, lav/lav
F1s...