Thru hull concerns

[cxz]

I've been changing some seacocks and thru hulls for the first time and wanted to get some thoughts on my process which I don't feel was done entirely professionally. I've made the upgrade to TruDesign and had to redo the galley sink thru hull twice now after I realized that the thru hull fitting needed to be 1 step up to match the hose sizes (wish they warned about that).

In particular, this thru hull for the galley sink had me thinking a bit. Some concerns:
1) I didn't put enough Sika 291 on the threads for the thru hull fitting. I figure it should be OK though. [pic 1, 3]

2) I stupidly decided to also put Sika on the plastic washer, which isn't a problem in itself, but when I tightened the nut I saw the Sika shifting a bit underneath the washer since it was now adhered to the nut. Would that have broken the seal? [pic 5]

3) I also tightened the nut 1/4 of a turn, not 1/2 as the manufacturer recommends since it was getting tight and they do mention not to overtighten. [pic 8]

I've attached some pictures and wanted to know what you thought. Am I just over-worrying? I feel like I put sealant where I shouldn't have and a bit too little where I should have. I don't think it's a huge issue and it should hold up OK, but it could have been done better.